mmon Core Grade 8 Algebra I A
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Which graph has a rate of change of zero?
Mark this and return

Answer:

Step-by-step explanation:

i)

(x+1)(7-x) = (x+1)(-x+7) = -x² + 6x + 7

standard form:  y = -x² + 6x + 7

for the vertex form you have to find the coordinates of the vertex (h, k):

a = -1, b = 6, c = 7

h = -b/2a = -6/2(-1) = 3

k = ah² + bh + c = -1(3)² + 6(3) + 7 = 16

vertex form:  y = a(x-h) + k

y = -1(x - 3) + 16

ii)

Dimensions of the largest rectangle that can be made are:

Plug in maximum value of x, x = 3

x + 1 = 3 + 1 = 4

7 - x = 7 - 3 = 4

largest rectangle is 4 x 4 = 16

Answer is attached

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Lola has 9/8 cups of rice left to use for the rice pudding.

What is fraction?

A fraction is a mathematical term that represents a part of a whole or a ratio between two quantities.

To find out how much rice Lola uses for the rice pudding, we need to first determine how much rice she used for the sushi rolls.

Lola used 3/4 of the 4 1/2 cups of rice for the sushi rolls. To calculate this, we can multiply:

4 1/2 cups x 3/4 = (9/2) x (3/4) = 27/8 cups

So Lola used 27/8 cups of rice for the sushi rolls.

To find out how much rice Lola has left for the rice pudding, we need to subtract the amount she used for the sushi rolls from the original amount of rice she had:

4 1/2 cups - 27/8 cups = 36/8 cups - 27/8 cups = 9/8 cups

Therefore, Lola has 9/8 cups of rice left to use for the rice pudding.

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Answer: [tex]6x^{2}[/tex] + 24x + 18

Step-by-step explanation: To multiply these two terms you multiply each individual term in the left parenthesis by each individual term in the right parenthesis.

A linear equation modeling Robert's weight-loss situation is x = 205 + 2y.

A linear equation is an equation modeling a straight-line relationship between two variables, for example, x and y.

The weight lost per week = 2 pounds

The number of weeks weight was lost, y = 6 weeks

Robert's weight after 6 weeks of losing 2 pounds weekly = 205

Let x = Robert's weight before the weight-loss program

x = 205 + 2y

x = 205 + 2(6)

x = 205 + 12

x = 217

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The value of n for each of the values in the problem have been shown below.

When multiplying exponential expressions with the same base, you can add the exponents. For example: a^m * a^n = a^(m+n).

When dividing exponential expressions with the same base, you can subtract the exponents. For example: a^m / a^n = a^(m-n).

An exponential expression with a fractional exponent can be rewritten as a radical expression. For example: a^(1/2) = √a.

We know that;

a^6/2 = a^n

n = 3

a^9/2 = a^n

n = 9/2

a^3(7/2) = a^n

n = 21/2

a^3/2 = a^n

n = 3/2

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The median and the range of the given data above would be =5 and 11 respectively.

The range of a data set can be calculated by the subtraction of the largest variable form the smallest variable of a data set.

That is;

Data set = 1,1,1,1,2,2,2,5,6,6,6,8,9,10,12

largest variable = 12

smallest variable = 1

range = 12-1 = 11

The median of the data set is the figure that fall at the middle of the data set after being arranged either in ascending or descending order.

The median of the data = 5

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The 95% confidence interval of the population mean for the given sample is between $86.96 and $87.54.

To calculate the confidence interval, we need to use the formula:

CI = [tex]\bar{X}[/tex] ± Zα/2 * σ/√n

where,

[tex]\bar{X}[/tex] = sample mean = $87.25

Zα/2 = the Z-score for 95% confidence level = 1.96

σ = population standard deviation = $20.00

n = sample size = 100,000

Plugging these values in the formula, we get:

CI = 87.25 [tex]\pm[/tex] 1.96 * (20/√100,000)

CI = 87.25 [tex]\pm[/tex] 0.098

Therefore, the 95% confidence interval of the population mean is between $86.96 and $87.54. This means that we can be 95% confident that the true population mean lies within this interval.

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A bar chart or a histogram are visual representations of data that can be used to explore a single column of data.

A bar chart is used to compare different categories of data, and a histogram is used to measure the frequency of data within a given range. Bar charts allow a user to compare the differences between the categories of data, while histograms provide a better indication of how the data is distributed within the range.

Both bar charts and histograms are useful for identifying patterns, outliers, and trends in the data. By using a bar chart or a histogram, a user can quickly and easily identify where the data is concentrated, as well as identify any outliers or trends in the data.

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The area of the Tri-Tri-Again board game is 3 1/8 square feet.

To calculate the area of a triangle, we need to know the length of its base and its height. In this case, Bridget's Tri-Tri-Again board game is in the shape of a triangle with a base of 1 1/4 feet and a height of 2 1/2 feet. To find the area of the triangle, we can use the formula for the area of a triangle, which is 1/2 x base x height.

We first convert the mixed numbers to improper fractions. The base is 5/4 feet and the height is 5/2 feet. We can then substitute these values into the formula to get:

Area of triangle = 1/2 x 5/4 feet x 5/2 feet

Area of triangle = 25/8 square feet

We can simplify the answer by dividing the numerator and denominator by the greatest common factor of 25 and 8, which is 1. This gives us:

Area of triangle = 25/8 square feet

Area of triangle = 3 1/8 square feet

Therefore, the area of the Tri-Tri-Again board game is 3 1/8 square feet.

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The data is bimodal, with a maximum range of 59.

This might be because students either did not understand and earned less than 51, or they knew the topic well and earned higher than 90.

Using the following terms: a student's grades in a history class are shown in the histogram.

Which statement best describes the spread and distribution of the data:

The data is almost symmetric, with a maximum range of 59.

This might be because the topic is easily understood by the students.

The data is skewed, with a maximum range of 59.

This might be because the teacher offered extra credit, and most of the students did that to increase their grades above 70.

The data is bimodal, with a maximum range of 59.

This might be because students either did not understand and earned less than 51, or they knew the topic well and earned higher than 90.

The data is symmetric, with a maximum range of 59.

This might be because the topic was very difficult for the students, and most of them earned lower grades.

The correct answer to this question is the data is skewed, with a maximum range of 59.

This might be because the teacher offered extra credit, and most of the students did that to increase their grades above 70.

Skewness refers to a condition in which the data is not symmetrical.

When data is skewed, it indicates that the majority of the data lies on one side of the graph, while the other side is either empty or has a small amount of data.

A histogram with a peak and a long tail is referred to as a positively skewed histogram, indicating that most of the data is on the left side of the graph.

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The possible range of x  in the triangle is (2.8,∞)

According to the triangle inequality theorem, any two sides' sums in a triangle must be bigger than the length of the third side. If a, b, and c are the lengths of a triangle's sides, then the sum of a and b's lengths is greater than c's length. Similar to how a+ c > b, b + c > a.

By applying the triangle inequality theorem, which asserts that if the sides have lengths a, b, and c, then a + c > b, it is feasible to determine the range of sizes for x. Let a = 4, 1, and 3 and c = x. Our range of values for x is as follows because measurements of length and distance can never be negative:

a + c > b 4.1 + x > 1.3 x > -2.8

Hence, x's potential size range is (-2.8, infinity).

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The equation of the line of reflection is y = (−13 / 45)x − (1376 / 45) in point-slope form.

To find the equation of the line of reflection between the points (-9, 12) and (17, -78), we first need to find the midpoint of the line segment joining these two points, which will lie on the line of reflection. The midpoint formula is:

[(x₁ + x₂) / 2, (y₁ + y₂) / 2]

Using the coordinates of the two given points, we get:

[(−9 + 17) / 2, (12 − 78) / 2] = [4, −33]

So, the midpoint is (4, −33).

Next, we need to find the slope of the line of reflection. This is equal to the negative reciprocal of the slope of the line passing through the two given points, since the line of reflection is perpendicular to this line. The slope of the line passing through the two given points is

m = (y₂ − y₁) / (x₂ − x₁) = (−78 − 12) / (17 − (−9)) = −90 / 26 = −45 / 13

So, the slope of the line of reflection is:

m' = −1 / m = −13 / 45

Finally, we can use the point-slope form of the equation of a line, with the midpoint we found as the point and the slope we calculated as the slope which is

y − (−33) = (−13 / 45)(x − 4)

y + 33 = (−13 / 45)x + (52 / 45)

or

y = (−13 / 45)x − (1376 / 45)

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Answer:

[tex]6 {x}^{2} + 21x + 18 [/tex]

Step-by-step explanation:

[tex](2x + 3)(3x + 6)[/tex]

[tex]6 {x}^{2} + 12x + 9x + 18[/tex]

[tex]6 {x}^{2} + 21x + 18[/tex]

A probability distribution is a listing of all possible outcomes along with their likelihood of occurrence.

It is a way of describing the likelihood of different outcomes in a statistical experiment or random event. It is used to calculate the probability of different events or outcomes in situations where there is uncertainty or variability. There are two types of probability distributions: discrete and continuous.

Discrete probability distributions are used when the possible outcomes of a statistical experiment are discrete or countable, such as the number of heads obtained in flipping a coin. Continuous probability distributions are used when the possible outcomes of a statistical experiment are continuous or uncountable, such as the height of people in a population.

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The appropriate theorem used to solve this inequality is the subtraction property of inequalities, which states that if a < b, then a - c < b - c for any real number c. In this case, we subtracted 7 from both sides of the inequality to isolate m.

It says   [tex]"7+m < 6=200"[/tex] which has an equal sign in between 6 and 200, which does not make sense. I will assume that the inequality you meant to provide is:

[tex]7+m < 6[/tex]

To solve this inequality, we want to isolate m on one side of the inequality. We can do this by subtracting 7 from both sides:

[tex]7 + m - 7 < 6 - 7[/tex]

Simplifying the left-hand side and the right-hand side, we get:

[tex]m < -1[/tex]

Therefore, the solution to the inequality  [tex]7+m < 6[/tex] is:

m < -1

We can verify this solution by plugging in a value of m that is less than -1, such as -2, into the original inequality:

[tex]7 + (-2) < 6[/tex]

Simplifying the left-hand side, we get:

[tex]5 < 6[/tex]

This is true, so the solution m < -1 is valid.

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The given question is incomplete. Complete question is given below:

Solve the inequality 7+m<6=200 using the appropriate theorem.

Answer:

217,100

Step-by-step explanation:

in this equation first you would want to add together 3000 + 340 which is 3340 then multiply that by 65. Remember to do addition and subtraction steps in multi-step equations first

We must first determine the total price of the bell peppers in order to determine the number of pounds Paula purchased. Paula bought a total of   [tex]2.8[/tex] pounds of bell peppers.

To determine the total pounds of bell peppers Paula bought, we first need to find the total cost of the bell peppers.

The cost of the red bell peppers is $2.56 and the cost of the green bell peppers is $ [tex]1.92[/tex] , so the total cost of both types of bell peppers is:

$ [tex]2.56[/tex] + $ [tex]1.92 =[/tex]$ [tex]4.48[/tex]

Since both types of bell peppers cost $[tex]1.60[/tex] per pound, we can use this information to find the total weight of the bell peppers.

Let x be the total weight of the bell peppers. Then we can set up the following equation:

$ [tex]1.60\times =[/tex]$[tex]4.48[/tex]

To solve for x, we divide both sides by $[tex]1.60[/tex]:

[tex]x = $4.48 / $1.60[/tex]

[tex]x = 2.8[/tex]

Therefore, Paula bought a total of   [tex]2.8[/tex] pounds of bell peppers.

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Answer:   2.8 pounds of bell pepper bought by Paula

Step-by-step explanation:

Given that :

At the grocery store, the amount spent by Paula :

The amount spent on red bell pepper =  $2.56

The amount spent on green bell pepper = $1.92

the total amount spent = $2.56+$1.92 = $4.48

If both the bell peppers are at  $1.60 per pound, then the total pounds of bell pepper Paula bought

= $4.48/ $1.60

= 2.8 pounds

Solution:

Therefore the number of pounds of bell pepper bought by Paula is 2.8.

The measure of angle x is 90°

In a semicircle, an angle that has its vertex at the center of the circle will always be a right angle, which is 90 degrees.

This is because a semicircle is defined as half of a full circle, and the diameter of a circle forms a right angle with any chord that it intersects.

Therefore, any angle in a semicircle that has its vertex at the center of the circle will be 90 degrees.

Thus, the measure of angle x is 90°.

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Therefore, the diagonal that connects the midpoints of the other two sides of the kite bisects the other diagonal.

A trapezoid is a quadrilateral with at least one pair of parallel sides. The parallel sides are called the bases of the trapezoid, and the non-parallel sides are called the legs. A trapezoid can have two pairs of parallel sides, in which case it is called a parallelogram.

Here,

First, let's define what a trapezoid and a kite are:

A trapezoid is a quadrilateral with at least one pair of parallel sides. The parallel sides are called the bases of the trapezoid.

A kite is a quadrilateral with two pairs of adjacent sides of equal length.

Now, let's look at some common trapezoid theorems and how to prove them:

The bases of a trapezoid are parallel.

To prove this theorem, we can use the fact that opposite angles of a parallelogram are equal. Since the bases of a trapezoid are parallel, we can draw a line segment that connects the endpoints of the non-parallel sides to form a parallelogram. The opposite angles of the parallelogram are equal, so the opposite angles of the trapezoid are also equal. Therefore, the bases of a trapezoid are parallel.

The legs of a trapezoid are congruent.

To prove this theorem, we can use the fact that a trapezoid can be divided into two triangles by drawing a diagonal. Since the bases of a trapezoid are parallel, the diagonal divides the trapezoid into two congruent triangles. Therefore, the legs of a trapezoid are congruent.

The diagonals of a trapezoid bisect each other.

To prove this theorem, we can use the fact that a trapezoid can be divided into two triangles by drawing a diagonal. Since the bases of a trapezoid are parallel, the diagonal divides the trapezoid into two congruent triangles. The diagonals of the trapezoid connect the midpoints of the non-parallel sides of the triangles, which are also the midpoints of the legs of the trapezoid. Therefore, the diagonals of a trapezoid bisect each other.

Now, let's look at some common kite theorems and how to prove them:

The diagonals of a kite are perpendicular.

To prove this theorem, we can use the fact that a kite can be divided into four right triangles. Since two pairs of adjacent sides of a kite are equal in length, the right triangles that share a common vertex have one leg that is perpendicular to the other leg. Therefore, the diagonals of a kite are perpendicular.

One diagonal of a kite bisects the other diagonal.

To prove this theorem, we can use the fact that a kite can be divided into four triangles. Since two pairs of adjacent sides of a kite are equal in length, the diagonal that connects the non-adjacent vertices of the kite divides the kite into two congruent triangles.

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Complete question:

Prove the trapezoid theorems: for Trapezoids and Kites.

In a parallelogram, The statement "angle A and angle D are supplementary" is not correct.

The same-side interior angles theorem states that if a transversal intersects two parallel lines, then the same-side interior angles are supplementary. However, in this case, we are dealing with a parallelogram, which has two pairs of parallel sides.

When we say that "ab||dc", we are stating that side AB is parallel to side DC. We cannot assume that side AD is a transversal between these two sides, as it could intersect the sides at some other angle. Therefore, we cannot conclude that angle A and angle D are angles.

However, we do know that opposite angles in a parallelogram are congruent. Therefore, we can conclude that angle A is congruent to angle C, and angle B is congruent to angle D.

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It is not possible for a study to have practical significance without statistical significance because statistical significance provides evidence that the observed effect is unlikely to have occurred by chance.

The Practical significance and statistical significance are two different concepts that are often used in hypothesis testing.

The Statistical significance refers to the probability that the observed results of a study occurred by chance, given a particular level of significance or alpha.

The Practical significance refers to whether the observed effect size is large enough to be meaningful in a real-world context.

It is possible for a study to have statistical significance without practical significance. For example, a study may find a statistically significant difference between two groups, but the difference may be so small that it is not meaningful in practice.

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May would therefore save $621,470.85 in interest costs if she opted for a 15-year simple interest mortgage ($798,750 - $177,279.15).

The sum of money that even a lender charges a loan for the usage of money over a certain period of time is known as interest. It is frequently represented as a proportion of the sum lent or borrowed and can be either simple or compound. Simple interest is determined by that of the principal amount alone, while interest expense is determined by the principal amount and the total amount of interest that has accrued. A key idea in banking, interest is utilised in a number of credit derivatives, including bonds, savings accounts, and loans.

given

May would save on interest costs if she chose a 15-year simple interest mortgage because the loan would be repaid sooner. Using the same technique as before but with n = 15 years, we can determine the interest costs for a 15-year mortgage:

PV is equal to PMT* [1 - (1 + r/12)(-n*12)] / (r/12)

Inputting the values provided yields:

355000 = PMT * [1 - (1 + 0.595%/12)^(-15*12)] / (0.595%/12)

PMT = $3,208.59

Over the course of the loan, the following would be paid in interest:

I equals PMT*n - PV.

I = $3,208.59 * 15 - $355,000

I = $177,279.15

May would therefore save $621,470.85 in interest costs if she opted for a 15-year simple interest mortgage ($798,750 - $177,279.15).

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Let's assume that the length of the rectangle is "x".

Since the width is 3 times the length, the width can be represented as "3x".

The perimeter of a rectangle is given by the formula:

P = 2(l + w)

where P is the perimeter, l is the length, and w is the width.

Substituting the values given in the problem, we have:

60 = 2(x + 3x)

Simplifying, we get:

60 = 8x

Dividing both sides by 8, we get:

x = 7.5

Now that we know the length, we can find the width:

width = 3x = 3(7.5) = 22.5

Therefore, the width of the rectangle is 22.5.

Answer:

Answer: 22.5

Step-by-step explanation:

Let L be the length of the rectangle, and W be the width.

From the problem, we know that:

The perimeter of the rectangle is 60, which means that:

2(L + W) = 60

L + W = 30

The width is 3 times the length:

W = 3L

Substituting W = 3L into the first equation, we get:

L + 3L = 30

4L = 30

L = 7.5

Therefore, the width is:

W = 3L = 3(7.5) = 22.5

So, the width of the rectangle is 22.5. Answer:  22.5

a . (–4 + i) + 4i = –4 + (i + 4i).The associative property of addition states that the grouping of the numbers being added does not change their sum.

In option (a), the expression on the left-hand side can be grouped as (–4 + i) + 4i, and the expression on the right-hand side can be grouped as –4 + (i + 4i). Both expressions result in the same sum of –4 + 5i. Therefore, option (a) demonstrates the associative property of addition.

The associative property of addition is a mathematical property that states that the grouping of the numbers being added does not affect their sum. In other words, when adding three or more numbers, the order in which the numbers are grouped for addition does not affect the result. Mathematically, the associative property of addition can be expressed as:

(a + b) + c = a + (b + c)

This property holds for any real numbers a, b, and c. The associative property of addition is a fundamental property of arithmetic and is used extensively in algebraic manipulations to simplify expressions and solve equations.

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Answer:

10

Step-by-step explanation:

rewrite as (x+2)⁵

use the binomial formula:

(a+b)⁵ = a⁵ + 5a⁴b + 10a³b² + 10a²b³ + 5ab⁴ + b⁵

a = x,  b = 2

The problem is only asking for the coefficient of the x⁴ expression, so the answer is:

5a⁴b = 5(x)⁴(2) = 10x⁴

Answer:

5

Step-by-step explanation:

Cost of bagels = 50 - 1.75 - 33.5 = 14.75

No. of bagels = 14.75/2.95 = 5

Answer:

You bought 5 bagels.

Step-by-step explanation:

Since you buy a coffee every day and it says "after 10 days" you multiply the price of the coffee by 10:     $3.35 * 10 = $33.5  

It also says that the remaining balance on the gift card is $1.75. So you need to subtract that from the original balance, 50:    $50- $1.75 = $48.25  -  this is the amount of money you spent.

Next, you subtract the price of all the coffees you bought from the amount of total money you spent over the course of 10 days.  $48.25 - $33.5 = $14.75

This remaining money is for the bagels that you bought on some days. The last step should be to divide $14.75 by the price of one single bagel:

$14.75 / 2.95 = 5  

You bought 5 bagels.

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