8. Spread = SD = sqrt(2*df)
9. The difference between the observed and expected frequencies of the outcomes of a set of events or variables.
10. Degrees of 1 freedom does the chi-square distribution.
11. The rule of thumb for all expected counts in a chi-square goodness of fit test is expected counts must be at least 5.
8. Describe the center and spread of the chi-square distributions.
Shape - skewed right because can't be zero
µ = df = tipping point
mode = df - 2 = peak
spread = SD = sqrt(2*df)
9. Chi-square test is a non-parametric test (a non-parametric statistical test is a test whose model does not specify conditions about the parameter of the population from which the sample is drawn.). It is used for identifying the relationship between a categorical variable and denoted by χ2.
10. A chi-squared distribution constructed by squaring a single standard normal distribution is said to have 1 degree of freedom. Thus, as the sample size for a hypothesis test increases, the distribution of the test statistic approaches a normal distribution.
11. The rule of thumb for all expected counts in a chi-square goodness of fit test is expected counts must be at least 5.
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the number 5/3 can be best described as a(n) ___.
Answer: Proper fraction
Step-by-step explanation:
A proper fraction is a fraction that has its numerator value less than the denominator.
For example, ⅔, 6/7, 8/9, etc. are proper fractions.
the clock on the wall at the aops office has an hour hand that's 4 cm long and a minute hand that's 8 cm long. at exactly 2:00, at what rate, in centimeters per minute, is the distance between the tips of the two hands changing?
At exactly 2:00, the distance between the tips of the two hands is changing at the rate of 4 cm/min.Therefore, at exactly 2:00, the distance between the tips of the two hands is changing at the rate of [tex]2\sqrt{13}[/tex] cm/min.
What is meant by "at exactly 2:00"?The phrase "at exactly 2:00" means that at 2:00:00, the hour hand and the minute hand overlap. Both hands are together pointing upwards in the vertical direction. At this moment, the angle between the minute hand and the hour hand is 0 degrees.How do we determine the rate of change of the distance between the tips of the two hands?We start by calculating the angle between the two hands. The angle is given by:
θ(t) = 30h - 11/2m
where h is the number of hours past midnight and m is the number of minutes past the most recent hour. At exactly 2:00, h = 2 and m = 0. Thus:
θ(t) = 30(2) - 11/2(0) = 60 degrees
Next, we use the formula for the distance between two points (the tips of the two hands). Let the hour hand be at the point (0,0) and let the minute hand be at the point (x,y).
The distance between the two points is given by:
[tex]d(t) = \sqrt{(x^2 + y^2)}[/tex]
To find x and y, we use the formulas:
x(t) = r cos θ(t)y(t) = r sin θ(t)
where r is the length of each hand. At exactly 2:00:
[tex]r = 4 cmx(t) = 4 cos 60 = 2 my(t) = 4 sin 60 = 2\sqrt{(3) m}[/tex]
Therefore: [tex]d(t) = \sqrt{(x^2 + y^2)} = \sqrt{(2 m)^2 + (2sqrt(3) m)^2)} = 2\sqrt{(13) m}[/tex]
Finally, we differentiate with respect to time t to find the rate of change of [tex]d(t):d'(t) = 2\sqrt{13}[/tex] cm/min
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Do the Cauchy-Schwarz Inequality and the triangle inequality hold for the given vectors and inner product?u = (5, 3), v = (14, 4), (u, v) = u · v(a) the Cauchy-Schwarz Inequality Yes / No(b) the triangle inequality Yes / No
a) Yes, the Cauchy-Schwarz Inequality holds for the given vectors and inner product. Since 74 ≤ 76.84, the Cauchy-Schwarz Inequality holds.
b) Yes, the triangle inequality holds for the given vectors and inner product. Since 20.25 ≤ 23.21, the triangle inequality holds.
How do we know the Cauchy-Schwarz Inequality and the triangle inequality hold given vectors and inner product?Cauchy-Schwarz Inequality:
Using the given inner product, we have:
|u · v| ≤ ||u|| ||v||where ||u|| and ||v|| denote the norms of the vectors u and v, respectively.
We can calculate:
||u|| = sqrt(5^2 + 3^2) = sqrt(34)||v|| = sqrt(14^2 + 4^2) = sqrt(212)Then, applying the Cauchy-Schwarz Inequality, we have:
|u · v| = |(5)(14) + (3)(4)| = 74||u|| ||v|| = sqrt(34) sqrt(212) ≈ 76.84Triangle Inequality:
The triangle inequality states that for any vectors u, v, and w, we have:
||u + v|| ≤ ||u|| + ||v||Using the given vectors, we can calculate:
||u + v|| = ||(5 + 14, 3 + 4)|| = ||(19, 7)|| = sqrt(19^2 + 7^2) ≈ 20.25||u|| + ||v|| = sqrt(5^2 + 3^2) + sqrt(14^2 + 4^2) ≈ 23.21Learn more about Triangle Inequality
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What is 2^5 help plsss
Answer: 32
Step-by-step explanation:
Answer:
Step-by-step explanation:
2 is the base and 5 is the exponent, so we have to multiply 2 5 times.
2*2*2*2*2=32
complaints about an internet brokerage firm occur at a rate of 7 per day. the number of complaints appears to be poisson distributed. a. find the probability that the firm receives 5 or more complaints in a day. probability
The probability that company will receive five or more objections in a single day is [tex]0.9951[/tex].
What are the basics of probability?Probability is simply the possibility that something will happen. We may talk about the possibility with one result, or the probability of numerous outcomes, if we don't understand how such an occurrence will turn out. Statistical is the study of events that follow a probabilistic model.
Is math in probability difficult?Probability is typically considered as one of the most difficult mathematical concepts because probabilistic arguments can occasionally give results that seem inconsistent or nonsensical. The Monty Hill paradox and the anniversary problem are two examples.
Let [tex]X[/tex] be the random variable denoting the number of complaints received in a day. We need to find P(X ≥ 5).
Using the Poisson probability mass function,
P(X ≥ 5) = 1 - P(X < 5)
[tex]= 1 - P(X = 0) - P(X = 1) - P(X = 2) - P(X = 3) - P(X = 4)[/tex]
[tex]= 1 - e^{(-7)(1 + 7 + 24.5 + 57.33 + 100.18)}[/tex]
[tex]= 1 - 0.0049[/tex]
[tex]= 0.9951[/tex]
Therefore, the probability that the firm receives [tex]5[/tex] or more complaints in a day is [tex]0.9951[/tex].
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An automobile manufacturer of a certain model of car wants to estimate the mileage this model car gets in highway driving. The population standard deviation is known to be 5.7 mpg. How many cars does the manufacturer need to sample so that a 90% confidence interval for the mean mileage of all cars of this model will have a margin of error of 1.5
mpg?
Please show your work! I would really like to understand this :)
If an automobile manufacturer of a certain model of car wants to estimate the mileage this model car gets in highway driving. The manufacturer needs to sample at least 39 cars.
How to find the sample?We can use the formula for the margin of error in a confidence interval for a mean:
Margin of Error = z* (σ/√n)
Where:
z* is the critical value of the standard normal distribution for the desired level of confidence, which is 90% in this case.
σ is the known population standard deviation, which is 5.7 mpg.
n is the sample size we want to determine.
We want the margin of error to be 1.5 mpg, so we can set up the equation:
1.5 = 1.645 * (5.7 / √n)
where 1.645 is the z-score for 90% confidence level.
Simplifying this equation, we get:
√n = 1.645 * (5.7 / 1.5)
√n = 6.251
Squaring both sides, we get:
n = 39.07
Rounding up to the nearest integer, we get:
n = 39
Therefore, the manufacturer needs to sample at least 39 cars to estimate the highway mileage with a 90% confidence interval and a margin of error of 1.5 mpg.
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joe scored in the 20th percentile on a standardized test. he brags to his friends that he scored better than 80% of the people who took the test. joe is .
Joe is incorrect in claiming that he scored better than 80% of the people who took the test.
The 20th percentile means that Joe's score was equal to or greater than 20% of the other test takers, but lower than 80%. The percentile is not a percentage, so the statement Joe made is false.
It is important to understand that percentile rankings are not the same as percentages. Percentile rankings measure how one’s score compares to others who have taken the same test. For example, if Joe scored in the 20th percentile, it means that 20% of the other test takers had the same or lower scores. On the other hand, percentages measure a proportion of the whole. In Joe's case, 80% would mean that 80 out of 100 test takers had a higher score than Joe.
To be more accurate, Joe could have said that he scored better than 20% of the people who took the test. Percentile rankings are often used to measure an individual's performance in comparison to a larger group of peers. Although Joe might have performed well, it is important to understand the difference between percentile and percentage.
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If a pair of straight lines represented by 3x² - 8xy + my² = 0 are perpendicular to each other, find the value of m.
Answer: -4
Step-by-step explanation:
If homogenous equation ax^2+2hxy+by^2=0---------------(a)
represent two perpendicular lines then, a+b=0
Calculation :
Given 3x² - 8xy + my² = 0
on comparing with equation (a) we get, a=3 and b=k
given lines are mutually perpendicular then
m+3= 0
m=-3
Write the equation of the line in standard form.
y = 3x + 10
X
x
X
X
A
B
C
D
3x + y = -10
3x + y = 10
3x - y = -10
3x - y = 10
The equation of the line y = 3x + 10 in standard form is 3x - y = -10.
What is the equation of line in standard form?Given the equation of line in the question:
y = 3x + 10
To write the equation of the line in standard form, we need to rearrange the equation so that the x and y terms are on the left side and the constant term is on the right side of the equation.
It is expressed as;
Ax + Bx = C
y = 3x + 10
Subtracting 3x from both sides, we get:
y - 3x = 3x - 3x + 10
y - 3x = 10
Reorder
-3x + y = 10
Multiply each term by -1
-3x(-1) + y(-1) = 10(-1)
3x - y = -10
Therefore, the equation in standard form is 3x - y = -10.
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what is the probability that the first question she gets right is question number 4? group of answer choices
The probability that the first question she gets right is question number 4, is 0.1054.
Number of options there are for a single query = 4
P(guessing correct answer for a single question) = 1/4
P(guessing correct answer for a single question) = 0.25
Probability of getting correct answer P(correct) = 0.25
Probability of getting wrong answer P(wrong) = 1 - Probability of getting correct answer
Probability of getting wrong answer P(wrong) = 1 - 0.25
Probability of getting wrong answer P(wrong) = 0.75
So, the probability that the first question she gets right is question number 4 = Probability of getting 1st question wrong × Probability of getting 2nd question wrong × Probability of getting 3rd question wrong × Probability of getting 4th question right
The probability that the first question she gets right is question number 4 = 0.75 × 0.75 × 0.75 × 0.25
The probability that the first question she gets right is question number 4 = 0.1055
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The complete question is:
In a multiple choice exam, there are 5 questions and 4 choices for each question (a, b, c, d). Nancy has not studied for the exam at all and decides to randomly guess the answers. (Round your answers to four decimal places.)
What is the probability that the first question she gets right is question number 4?
what is the probability that a randomly selected senator is up for reelection in november 2014? (enter your probability as a fraction.)
However, if we assume that the election cycle follows the typical pattern, where one-third of the Senate is up for reelection, then the probability would be approximately 1/3 or 0.333 as a fraction.
The probability that a randomly selected senator is up for reelection in November 2014 depends on the specific year and election cycle in question. In general, the term length for a U.S. senator is six years, and approximately one-third of the Senate is up for reelection every two years.
Therefore, the probability that a randomly selected senator is up for reelection in November 2014 would depend on the number of senators whose terms expire in that election cycle. Without additional information, it is not possible to determine this probability.
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What is the range of this data?
{3, 3, 0, 8, 7, 10, 2, 6, 12, 0}
Subtract the minimum data value from the maximum data value to find the data range. In this case, the data range is [tex]12-0=12[/tex].
[tex]\bold{12}[/tex]
Prove the following question
We have shown that sin3A.cos2A - cos3A.sin2A / cos3A.cos2A + sin3A.sin2A = tanA is true for all values of A where the trigonometric functions are defined.
What is trigonometry?
The area of mathematics concerned with how triangles' sides and angles relate to one another as well as with the pertinent uses of any angle.
We can start by using trigonometric identities to simplify the left-hand side of the equation:
sin3A.cos2A - cos3A.sin2A = sin(3A + 2A) - sin(3A - 2A)
(using sum and difference formulae)
= 2 sin5A cosA
cos3A.sin2A = cos(3A - 2A) - cos(3A + 2A)
= -2 sinA cos5A
Substituting these into the original equation, we get:
(2 sin5A cosA) / (cos3A cos2A + sin3A sin2A) - (-2 sinA cos5A) / (cos3A cos2A + sin3A sin2A)
Simplifying further:
2 sin5A cosA + 2 sinA cos5A / (cos3A cos2A + sin3A sin2A)
We can use the identity tanA = sinA / cosA to write this as:
2 sinA cosA (sin4A + cos4A) / (cos3A cos2A + sin3A sin2A)
Using the identity sin2A + cos2A = 1 and rearranging, we get:
2 tanA (1 - sin2A cosA) / (cos2A + sin2A cosA)
= 2 tanA cosA / (cos2A + sin2A cosA)
= 2 sinA / (1 + cosA)
= (2 sinA / (1 + cosA)) * ((1 - cosA) / (1 - cosA))
= 2 sinA (1 - cosA) / (1 - cos^2A)
= 2 sinA (1 - cosA) / sin^2A
= 2 (1 - cosA) / sinA
= 2 sinA / sinA
= 2
Therefore, we have shown that sin3A.cos2A - cos3A.sin2A / cos3A.cos2A + sin3A.sin2A = tanA is true for all values of A where the trigonometric functions are defined.
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Order the sides from least to greatest
Sides: BC, AB, AC
Answer: BC, AC, AB
Step-by-step explanation: I think I'm wrong but tell me if I'm right.
an oil storage tank can be described as the volume generated by revolving the area bounded by about the x-axis. find the volume of the tank (in cubic meters). round to four decimal places.
The volume of the tank can be found using the given information as:[tex]Volume=\int\limits^b_a {\pi f(x)^2} \, dx[/tex]
How to find the volume of the tank?Assuming that the area bounded is given by a function f(x), the volume of the oil storage tank can be calculated using the formula for the volume of a solid of revolution:
[tex]Volume=\int\limits^b_a {\pi f(x)^2} \, dx[/tex]
where a and b are the limits of integration. In this case, the axis of revolution is the x-axis, so we are revolving the area about the x-axis.
Therefore, the volume of the tank can be found using the given information as:
[tex]Volume=\int\limits^b_a {\pi f(x)^2} \, dx[/tex]
We need more information about the function f(x) or a curve that bounds the area in order to find the limits of integration and calculate the volume.
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Find the percentile rank for Susan who is 5th in a class of 58 students
From the given information provided, Susan's percentile rank in class is approximately 6.9%.
To find the percentile rank for Susan who is 5th in a class of 58 students, we need to use the following formula:
Percentile rank = (Number of students below Susan / Total number of students) x 100
Since Susan is the 5th student in the class, there are 4 students with higher ranks than her. Therefore, the number of students below Susan is 4.
Using the formula, we can calculate the percentile rank as:
Percentile rank = (4 / 58) x 100
Percentile rank = 6.9 (rounded to one decimal place)
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Plssss help I have no idea the answer to this question
Answer:
circle K has greater area that circle J by 2000.18 cm sq.
Step-by-step explanation:
area of circle => π r^2
area of circle j = 3.14 x 18 x 18 = 1017.36
area of circle K = 3.14 x 31 x 31 =3017.54
the difference in their areas : 3017.54- 1017.36 = 2000.18
in the context of lean tools and approaches, , one of the components of the 5s principles, refers to a clean work area. question 29 options: shine standardize sort sustain
In the context of lean tools and approaches, one of the components of the 5s principles refers to a clean work area. The component that is being referred to here is "shine".
What is 5s principlesThe 5s principles are a set of lean tools and approaches that are used to promote workplace organization, efficiency, and safety. These principles include:
Sort: This involves organizing the workplace by separating what is needed from what is not needed, and discarding what is not needed. This helps to reduce clutter and improve organization.Standardize: This involves setting standards and procedures for how work is done, and ensuring that these standards are followed consistently.Shine: This involves cleaning the workplace and equipment to ensure that they are free from dirt and grime, and to prevent breakdowns and defects.Sustain: This involves creating a culture of continuous improvement, where everyone is responsible for maintaining the 5s principles and identifying opportunities for further improvement.Learn more about the 5s principles at
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diana ran a race of 700 meters in two laps of equal distance. her average speeds for the first and second laps were 7 meters per second and 5 meters per second, respectively. what was her average speed for the entire race, in meters per second?
Diana's average speed for the entire race was approximately 0.583 meters per second.
We can start by using the formula
average speed = total distance / total time
We know that Diana ran a total distance of 700 meters, and we can find the total time by adding the time for the first lap and the time for the second lap. Let's call the distance of each lap "x"
total distance = 700 meters
distance for each lap = x meters
So, the total time is
total time = time for first lap + time for second lap
To find the time for each lap, we can use the formula
time = distance / speed
For the first lap, we have
time for first lap = x / 7
For the second lap, we have
time for second lap = x / 5
So, the total time is
total time = (x / 7) + (x / 5)
We can simplify this by finding a common denominator
total time = (5x + 7x) / (35)
total time = (12x) / 35
Now, we can substitute the values we have into the formula for average speed
average speed = total distance / total time
average speed = 700 / [(12x) / 35]
average speed = (700 × 35) / (12x)
average speed = 204.166... / x
To find the average speed for the entire race, we need to find the value of "x" that makes this expression true. We know that the two laps are equal in distance, so we can set
x + x = 700
2x = 700
x = 350
Substituting this value of "x" into the expression for average speed, we get
average speed = 204.166... / 350
average speed ≈ 0.583 meters per second
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The distance from the center of the circle to any point on the edge of the circle. Responses a) Radius b) Circumference c) Diameter d) Tangent Line
Answer:
B. Radius
The line from the center of a circle to the edge is called a radius. The radius can be used in pi and a lot of other things
This is for algebra 1 in grade 9. Can anyone help?
The repair costs $90 for parts, plus $70 per hour for labor describes the situation. The solution has been obtained by using the equation.
What is an equation?
An equation is an assertion that two expressions containing variables and/or numbers are equivalent. The basic driving factors behind the growth of mathematics have been the attempts to rationally answer equations, which are essentially questions.
We are given an equation of the function as C(x) = 90 + 70x.
This depicts that $90 is fixed cost whereas $70 is variable cost and is dependent on the value of x.
So, the statement that describes the given situation is that the he repair costs $90 for parts, plus $70 per hour for labor.
Hence, the fourth option is the correct option.
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the club has 20 members, 7 of whom are seniors. if you pick a committee of 3 from this club, what is the probability that all 3 are seniors?
Answer:
7/20
Step-by-step explanation:
ok so it has 30 members, 7 are seniors it's possible. if there is multiple choice just let me know if it is not on there.
say you randomly select americans until you find one who is married. how many americans would you expect to select in order to find your first married respondent? round to two decimal places.
On average, you would expect to select approximately 1.90
Americans in order to find your first married respondent. This is because according to the U.S. Census Bureau, the national marriage rate in 2018 was 6.9 per 1,000 individuals, which is equivalent to 0.69% of the population being married.
Therefore, if we assume the population of Americans is uniformly distributed, the probability of randomly selecting a married American is 0.69%. Consequently, the expected number of trials necessary to select a married respondent is 1/0.0069 = 1.90.
To calculate this, we used the probability formula for a single trial: P(X) = N/S, where P(X) is the probability of success, N is the number of successes, and S is the number of trials.
Therefore, by substituting the number of successes (1) and the probability of success (0.0069) into the formula, we can determine the expected number of trials necessary to select a married respondent (1/0.0069 = 1.90).
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A ring shaped region is shown below. Its inner radius is 10m. The width of the ring is 3m.
Find the area of the shaded region.
Answer:
The ring-shaped region has an inner radius of 10m and a width of 3m. To find the area of the shaded region, we need to subtract the area of the inner circle from the area of the outer circle. The area of a circle is given by A = πr^2, where r is the radius. Therefore, the area of the outer circle is A1 = π(10+3)^2 = 169π m^2 and the area of the inner circle is A2 = π(10)^2 = 100π m^2. Subtracting these two areas gives us: A1 - A2 = (169π - 100π) m^2 = 69π m^2. Therefore, the area of the shaded region is approximately 216.27 m^2 (69π ≈ 216.27) .
A bag contains hair ribbons for a spirit rally. The bag contains 8 black ribbons and 12 green ribbons. Lila selects a ribbon at random, then Jessica selects a ribbon at random from the remaining ribbons. What is the probability that Lila selects a black ribbon and Jessica selects a green ribbon? Express your answer as a fraction in simplest form.
The Probability of that Lila selects a black ribbon and Jessica selects a green ribbon = 6/35. What is Probability? Probability is possibility that deals with "occurrence of random event. It values varies from 0 to 1". According to the question,
Number of black ribbon = 3
Number of green ribbon = 12
Total number of ribbon = 3+12 =15
Formula for Probability of an event P(E) = (Number of favorable outcomes) /(Total number of outcomes)
Probability of Lila selecting black ribbon =3/15
Jessica selects a ribbon at random from the remaining ribbons, therefore total number of ribbons is reduced to 14.
Probability of Jessica selecting Green ribbon = 12/14
The Probability of that Lila selects a black ribbon and Jessica selects a green ribbon =(3/15)(12/14)=6/35.Hence, the Probability of that Lila selects a black ribbon and Jessica selects a green ribbon is 6/35.
Can you please show the steps on how to get this?
Answer:
The total volume of the space is 55,000 cm³
Step-by-step explanation:
First, figure out the length for each of the two prisms. The prism on the right has a length of 25 cm, so we can subtract that from 50 cm (the combined length of both prisms) to get 25 cm.
Next, figure out the volume of each area. For a rectangular prism, Volume = length · width · height. The left prism's volume is 30,000 cm³ (do 25 · 60 · 20) while the right prism's volume is 25,000 cm³ (do 25 · 25 · 40).
Lastly, add the volumes together to get the total volume, which is 55,000 cm³
The function p(x) = 30 000(0.68)* models the
resale value of a car after x years.
Kala says that the value of the car is decreasing by
32% each year. Remy says the value of the car is
decreasing by 68%.
1.1 Who is correct? Explain your thinking.
1.2 How would the function change if the value of
the car decreased by 15% each year?
We can claim that after answering the above question, the This function would simulate the car's resale value if it depreciated at a rate of 15% each year.
what is function?In mathematics, a function is a relationship between two sets of numbers in which each member of the first set (known as the domain) corresponds to a single element in the second set (called the range). In other words, a function takes inputs from one set and produces outputs from another. Inputs are commonly represented by the variable x, while outputs are represented by the variable y. A function can be described using an equation or a graph. The equation y = 2x + 1 represents a linear function in which each value of x yields a distinct value of y.
1.1) Both Kala and Remy are incorrect. The given function, [tex]p(x) = 30,000(0.68)^x[/tex], models the resale value of an automobile after x years, with a starting value of $30,000. The function's exponent x reflects the number of years since the car was purchased, and the base 0.68 is the percentage of the original value that remains after each year.
1.2) If the car's value fell by 15% per year, the function would be[tex]p(x) = 30,000(1 - 0.15)^x[/tex]. This means that the car loses 15% of its worth each year, leaving 85% of the value. This function would simulate the car's resale value if it depreciated at a rate of 15% each year.
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13. Solve the inequality |2x + 2|> 4. Graph the solution
Answer: We can solve the given inequality as follows:
|2x + 2| > 4
There are two cases to consider, depending on whether the expression inside the absolute value is positive or negative:
Case 1: 2x + 2 > 4
2x > 2
x > 1
Case 2: 2x + 2 < -4
2x < -6
x < -3
Therefore, the solution to the inequality is x < -3 or x > 1.
To graph the solution, we can plot the two critical points x = -3 and x = 1 on a number line, and shade the regions to the left of -3 and to the right of 1. This gives us the following graph:
<==================o-----------------o===================>
x < -3 x > 1
The open circles indicate that the points -3 and 1 are not included in the solution, since the inequality is strict (|2x + 2| > 4).
Step-by-step explanation:
How can I write an eqvilent expression for 2(n+2)
The equivalent expression for 2(n+2) is 2n +4.
Equivalent expressions are expressions that have the same effect even though they look different. If two algebraic expressions are equivalent, then both expressions have the same value when we insert the same value for the variable.
Problems with equivalent expressions often have simple and complex expressions. Check which complex expression is equivalent to a simple expression:
(1) Divide any coefficient: a(bx±c) = abx± aca, open parenthesis, b, x, addition and subtraction, c, close parenthesis, equals , a , b, x, plus or minus, a, c.
(2) Combine all like terms on both sides of the equation: the x term and the constant.
(3) Arrange the terms in the same order, usually the term x precedes the constant.
(4) Two expressions are equivalent if all their terms are identical.
The given expression is : 2(n+2)
Multiplying the expression by 2 : 2n+4
Here, 2n + 4 is the equivalent expression.
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Rickey bought a 35 pound bag of dog food . His dog eats an average of 3.5 pounds a day . How many pounds will remain in the bag after 8 days
Answer:
7 pounds
Step-by-step explanation:
3.5×8=28 pounds
35-28=7 pounds
so 7 pounds will b left