Mathematics College

In which direction does the parabola defined by the equation x = 2y^2 – 4 open?

Answers

Answer 1

Answer:

Upward

Step-by-step explanation:

Upward the graph looks like the above picture.

In Which Direction Does The Parabola Defined By The Equation X = 2y^2 4 Open?

Related Questions

The teacher’s bookshelf is 7 feet tall. She builds one more shelf on it that is ¾ of a foot tall. How tall is her bookshelf now?

Answers

All correct answers bellow (in order of most logical units to be using)

7 3/4 feet
7foot 9inches
236.22cm
2m 36.22cm

$35
130
b Bettieis Boutlque is having a 20% off sale
original price sale price
$15
$12
$25
120
$35
$28

Answers

Assuming we need to find out what 20% off of the prices listed is, we can set up equations for each of them, where x is the original price.

New price = [tex]\frac{8}{10} x[/tex] or simplified to [tex]\frac{4}{5} x[/tex]

So, putting the original prices through the formula, we get these values:

$15 --> $12
$12 --> $9.60
$25 --> $20
$120 --> $96
$35 --> $28
$28 --> $22.40

1) Debbie bought 8 oranges and 7 apples for $10.20. Katrina bought 5 oranges and 14 apples for $12.15. How much did one apple and one orange cost?

2) Joel and Janie are selling fruit. Joel sold 2 small boxes of fruit and 5 large boxes for $31. Janie sold 4 small boxes of fruit and 7 large boxes for $47. How much does one small box of fruit and one large box of fruit cost?

3) Carmen is trying to decide which jet ski rental plan to use. Plan A charges a one-time fee of $40 and $25 per hour. Plan B charges a one-time fee of $60 and $15 per hour. After how many hours will the plans cost the same?

4) Julie and Wendi purchased cell phones. Julie’s phone cost $50 and she pays $0.35 per minute. Wendi’s phone cost $70 and she pays $0.15 per minute. After how many minutes of use will Julie’s phone cost more than Wendi’s?

5) 78 students went on a field trip. They went by van or car. The total number of cars and vans were 10. Each car held 5 students and each van held 12 students. How many cars and how many vans went on the field trip?

6) 168 students went on a field trip. They took a total of 10 vans and buses. Each bus held 42 students, and each van held 6 students. How many vans went on the field trip?

7) Christina spent $81.25 on books. Comic books cost $2.25 each and novels cost $7.00 each. If she bought 15 books, how many comic books did she buy?

8) Tina bought 8 pieces of clothing for a total of $164. Jeans cost $22 each and shirts cost $18 each. How many shirts did Tina buy?

9) Farmer Brown had 25 cows and chickens. They had a total of 72 legs. How many cows and how many chickens did Farmer Brown have?

10) Farmer Brown had 28 cows and chickens. They had a total of 96 legs. How many cows and how many chickens did Farmer Brown have?

What you need to do:

Please WRITE both equations for each problem, identify what your variables represent, and solve the system.

I don’t know what to do, so please help me understand by explaining how you got the answer.
I WANT TO LEARN FROM YOU! :)
- Will give BRAINLIEST if it gives me the option -

Answers

Hey there!

Question no.5:

78 students went on a field trip. They went by van or car. The total number of cars and vans were 10. Each car held 5 students and each van held 12 students. How many cars and how many vans went on the field trip?

Solution:

Let the number of cars be "x" and the number of vans be "y".

According to question,

x + y = 10 5x + 12y = 78 -->(ii)

=> 5(x + y) = 10 × 5

=> 5x + 5y = 50 -->(i)

By Elimination method,

Equation (i) - (ii) we get,

(5x + 5y) - (5x + 12y) = 50 - 78

=> 5x + 5y - 5x - 12y = - 28

=> - 7y = - 28

=> 7y = 28

=> y = 28/7

=> y = 4

Putting the value of "y" in Equation (i)

5x + 5y = 50

=> 5x + 5 × 4 = 50

=> 5x + 20 = 50

=> 5x = 50 - 20

=> 5x = 30

=> x = 30/5

=> x = 6

Therefore,

The total number of cars went = 6

The total number of vans went = 4

====================================================

Question no.6:

168 students went on a field trip. They took a total of 10 vans and buses. Each bus held 42 students, and each van held 6 students. How many vans went on the field trip?

Solution:

Let the number of buses be "x" and the number of vans be "y".

According to question,

x + y = 10 42x + 6y = 168 -->(ii)

=> 42(x + y) = 10 × 42

=> 42x + 42y = 420 -->(i)

By Elimination method,

Equation (i) - (ii)

(42x + 42y) - (42x + 6y) = 420 - 168

=> 42x + 42y - 42x - 6y = 252

=> 36y = 252

=> y = 252/36

=> y = 7

Putting the value of "y" in Equation (ii)

42x + 6y = 168

=> 42x + 6 × 7 = 168

=> 42x + 42 = 168

=> 42x = 168 - 42

=>42x = 126

=> x = 126/42

=> x = 3

Therefore,

Total number of buses went = 3

Total number of vans went = 7

The sum of two numbers is 143 and their difference is 7. What are the numbers?

Answers

Answer:

The numbers are 75,68

Step-by-step explanation:

Let the number be a ,b

The sum of two numbers is 143

⇒ x + y = 143 -------------(I)

Their difference is 7

⇒ x - y = 7 --------------(II)

Add the equation (I) & (II) and thus y will be eliminated and we can find the value of x

(I) x + y = 143

(II) x - y = 7 {Now add}

2x = 150

x = 150 ÷ 2

x = 75

Substitue x = 75 in equaion (I)

75 + y =143

y = 143 - 75

y = 68

what is the mode median mean and range of 4,5,0,2,3,1

Answers

Answer:

Mode = none, Median = 2.5, Mean= 2.5

Step-by-step explanation:

Hope this helps! :)

Step-by-step explanation:

the mode is the data item that occurres the most often.

but in 4, 5, 0, 2, 3, 1 every number appears only once. so, the mode is 0, 1, 2, 3, 4, 5 (as special case this average number can have more than one value - like in our case here).

the median is the value in the data set that lies directly in the middle between the other values (half of them are higher, the other half is lower).

if our data set has an even number of data points, or there is no unique middle value for other reasons, then the median is the mean value of the 2 middle values.

in our case 2 and 3 are the 2 middle values, so the median is (2+3)/2 = 2.5

the mean value is directly the average value across the whole data set : the sum of all values divided by the number of values.

(0+1+2+3+4+5)/6 = 15/6 = 2.5

the range is the difference between the highest and the lowest value in the data set : 5 - 0 = 0

Solve the equation below by factoring:

Answers

[tex]\huge\fcolorbox{blue}{aqua}{Answer:}[/tex]

═════════════════════

Answer: =A.[tex]x = - 3[/tex] [tex]x = - 4[/tex]

Solution:

[tex]x ^ { 2 } +7x=-12[/tex]

[tex]x^{2}+7x+12=0 [/tex]

[tex]a+b=7 ab=12 [/tex]

[tex]1,12 2,6 3,4 [/tex]

[tex]1+12=13 2+6=8 3+4=7 [/tex]

[tex]a=3 b=4 [/tex]

[tex]\left(x+3\right)\left(x+4\right) [/tex]

[tex]x = -3[/tex] , [tex]x = -4[/tex]

so the answer is = A.

════════════════════

Explanation:

#Carry on learning

Ask: Which two numbers add up to 7
7 and multiply to 12?
3 and 4

Rewrite the expression using the above.
(x+3)(x+4) = 0
x+3=0 or x+4=0
So x = -3 or x= -4

please help!!!

A store is advertising a sale with 15% off all prices in the store. Sales
tax is 8%.

Which expressions represent the total cost of buying an item with
an original price of p, after the dischwunt and sales tax are included?

A. 1.08p - 0.15p
B. 1.15p + 0.08p
C. 1.08(0.85p)
D .85p + (0.08)(0.85p)
E. p - 0.15p + 0.08p

Answers

Answer:

The right answer is C

Step-by-step explanation:

1.08(0.85p)

Help. Parallelogram ABCD is shown with vertices A(−2, 3), B(3, 3), C(2, −3) and D(−3, −3)

Answers

The coordinates of the image of the parallelogram ABCD after the transformations are A''(-2,-3), B'(3, -3), C'(2, 3) and D'(-3, 3)

How to determine the final vertices?

The coordinates of the parallelogram ABCD are given as:

A(−2, 3), B(3, 3), C(2, −3) and D(−3, −3)

When reflected across the y-axis, the rule of transformation is:

(x,y) -> (-x,y)

So, we have:

A'(2, 3), B'(-3, 3), C'(-2, -3) and D'(3, −3)

When rotated by 180 degrees, the rule of transformation is:

(x,y) -> (-x,-y)

So, we have:

A''(-2,-3), B'(3, -3), C'(2, 3) and D'(-3, 3)

Hence, the coordinates after the transformations are A''(-2,-3), B'(3, -3), C'(2, 3) and D'(-3, 3)

Answers

The appropriate values of n and r are illustrations of permutation.

The values of n and r are 75 and 10, respectively

How to determine the appropriate values of n and r?

From the question, we have the following parameters:

Albums = 6Total songs = 75Songs to arrange in a album = 10

The above means that:

n = 75

r = 10

This can be interpreted as:

Arrange 10 songs from a list of 75 songs

Hence, the appropriate values of n and r are 75 and 10, respectively

Answers

Answer:

1. 0.047, 0.453

2. 343

Step-by-step explanation:

The confidence interval regarding the veterinarian will be (0.045, 0.455).

How to depict the confidence interval?

Sample success = 10

Sample size = 40

Pt estimate = 10/40 = 0.25

Standard error = 0.0685

The corresponding interval is (0.045, 0.455).

The sample size that the veterinarian should use to achieve a margin of error will be:

Margin of error = 0.08

Critical Z = 3.0

Estimated proportion = 0.5

Sample size = p × (1-p) × (z/e)²

= 0.5 × (1-0.5) × (3/0.08)²

= 352

Learn more about confidence interval on:

https://brainly.com/question/15712887

Mai drank x oz of juice and Kiran
drank more than that.

Answers

Answer:

x≤k

Step-by-step explanation:

k= how many oz. Kiran drank. -Crispin

A triangle has side lengths 25, 15x and 20x. The longest side is 25. What value for x proves that this triangle is a right triangle?

Answers

Answer:x = 1Step-by-step explanation:

To prove that this triangle is a right triangle, we need to check the side lengths using pythogoras theorem.

Given:

Longest side = 25 unitsTriangle side lengths: 25, 15x, and 20x

Putting the side lengths into pythogoras theorem:

⇒ [tex]25^{2} = 15^{2} + 20^{2}[/tex]⇒ [tex]625 = (10x + 5x)^{2} + (20x + 0x)^{2}[/tex]

Using the formula "(a + b)² = a² + 2ab + b²

⇒ [tex]625 =[(10x)^{2} + 2(10x)(5x) + (5x)^{2} ] + [(20x)^{2} + 2(20x)(0) + (0)^{2} ][/tex]⇒ [tex]625 = [(10x)(10x) + 2(10x)(5x) + (5x)(5x)] + [(20x)(20x)][/tex]⇒ [tex]625 =[100x^{2} + 100x^{2} + 25x^{2} ] + [400x^{2} ][/tex]⇒ [tex]625 = 100x^{2} + 100x^{2} + 25x^{2} + 400x^{2}[/tex]⇒ [tex]625 = 625x^{2}[/tex]

Divide both sides by 625:

⇒ [tex]\frac{625}{625} = \frac{625x^{2}}{625}[/tex]⇒ [tex]1 = x^{2}[/tex]⇒ [tex]\sqrt{1} = \sqrt{x^{2} }[/tex]⇒ [tex]\sqrt{1 \times 1} = \sqrt{x \times x }[/tex]⇒ [tex]1 = x[/tex]

The value of x that proves this triangle a right triangle is 1.

x = 1

If it is a right angle triangle

→ (short side)² + (short side)² = (long side)²

given long side is 25

====================================

(15x)² + (20x)² = 25²225x² + 400x² = 625625x² = 625x² = 1x = √1x = ±1

as distance is positive

x = 1

Given rectangle WSDV, WD = 5−31 and SV = 2+11. Find the measurement of diagonal SV

Answers

Answer:

wheres tha rectangle

Step-by-step explanation:

Refer to the graph representing the number of hybrid cars sold in January in the United States for the given years.
What is the difference between the January sales in 2008 and 2007?
The difference is _____ cars.

Answers

Answer:

First, let's find how many hybrid cars are sold during those two years.

2007 = 17,300 hybrid cars were sold

2008 = 22,600 hybrid cars were sold

Find the difference by subtracting the cars in 2007 from 2008.

22,600(2008) - 17,300(2007)

= 5,300

The difference is 5,300 cars.

please help me with this graph problem. NO LINKS!!!

Answers

Step-by-step explanation:

Eric runs for 4 min and walks for 8 min.

The distance covered is

4*200 + 8*80 = 800 + 640 = 1440

The goal of 1600 m is not met, needs additional 160 m

The equation of distance is

d = 200x + 80y

For d = 1600, the equation is

200x + 80y = 1600

Simplified form of it

2.5x + y = 20

Some combinations of x and y to make the equation right

x = 2, y = 15x = 4, y = 10x = 6, y = 5

See the attached graph for more combinations, where the first coordinate represents running time and the second coordinate - walking time

Answer:

Part (a)

Given:

Average running speed = 200 m/minAverage walking speed = 80 m/min

If Eric runs for 4 minutes ⇒ 200 x 4 = 800 m

If Eric walks for 8 minutes ⇒ 80 x 8 = 640 m

Total distance covered = 800 + 640 = 1440 m

Therefore, he is 160 m away from his 1600 m goal.

Part (b)

Let x = number of minutes Eric runs

Let y = number of minutes Eric walks

Let d = total distance Eric covers

Equation: d = 200x + 80y

Part (c)

Set d = 1600, then rewrite to make y the subject:

200x + 80y = 1600

⇒ 5x + 2y = 40

⇒ 2y = 40 - 5x

⇒ y = 20 - 2.5x

Now find ordered pairs (points on the line):

x-intercept (y = 0): 20 - 2.5x = 0 ⇒ x = 8 ⇒ (8, 0)y-intercept (x = 0): 20 - 2.5(0) = 20 ⇒ (0, 20)when x = 4: 20 - 2.5(4) = 10 ⇒ (4, 10)

Part (d)

Plot (8, 0) (0, 20) and (4, 10) and connect with a straight line.

(see attached graph)

From inspection of the graph, other combinations of running and walking times for which Eric would cover 1600 meters are:

2 minutes running, 15 minutes walking6 minutes running, 5 minutes walking

Find the volume of the figure?

Answers

Answer:

Make two piece of this figure

Step-by-step explanation:

then use formula of v = l × b × h

Question 26 of 27
Find the value of x that makes ABCD a parallelogram.

Answers

Answer:

60°

Step-by-step explanation:

→ Find the sum of the angles

70 + 70 + x + 50 + x + 50 = 2x + 240

→ Equate the expression to 360

2x + 240 = 360

→ Minus 240 from both sides

2x = 120

→ Divide both sides by 2

x = 60

I need help with this crazy Algebra 1a problem!
You have 14 coins in your pocket that are either quarters or nickels. The total value of the coins is $2.50.
A. Write a system of two equations that represents this situation. Let q represent the number of quarters and n represent the number of nickels.
B. Solve each equation for q.
D. What is the solution to the system?
E. Verify that the answer to part D is correct using the answer to part A.
F. How many of each coin are there?

Answers

Answer:

See below.

Step-by-step explanation:

A. First equation is

q + n = 14

then we have

0.25q + 0.05n = 2.5

Multiply last equation by -20

-5q - n = -50 Now add this to the first equation

-4q + 0 = -36

B. q = -36/-4 = 9.

D Substitute for q in the first equation

9 + n = 14

n = 14 - 9 = 5.

So the solution to the system is q = 9, n = 5.

E Verify this solution by substituting in the second equation:

0.25(9) + 0.05(5)

= 2.25 + 0.25 = 2.50.

- verified.

F. 9 quarters and 5 nickels.

Write an equation to find the value of x and solve it. Round your answer to the nearest tenth if necessary.

x =

Write your equation and explain how you came up with your equation and how you solved it. What concepts apply to this problem? How do you know your answer is correct?

Answers

Answer: x = 14

Step-by-step explanation:

Please help on math.

Answers

45
The median is the number in the middle of the box

To know witch one it is look for the dot in the middle

You deposit all of your graduation money, $2,560, into an account earning 3.5% interest, compounded annually. You want to let it sit, no deposits or withdraws, while you are in college for 4 years. How much will you have at the end of 4 years? Round to the nearest cent.

Answers

Answer:

To calculate compounded interest, use the compound interest formula.

A(t)=P(1+rn)n⋅t

Recognize the information given in the problem.

P=2560,r=0.035,n=1,t=4

Substitute the values into the appropriate position in the formula.

A(4)=2560(1+0.0351)1⋅4

Simplify by multiplying and dividing by 1.

A(4)=2560(1+0.035)4

Simplify using the order of operations.

A(4)=$2,937.66

The balance at the end of 4 years would be $2,937.66.

Step-by-step explanation:

Find the interest paid on a loan of $8,000 for 1 year at a simple interest rate of 8% per year.
O A. $720
O B. $64
C. $8.640
O D. $640

Answers

Answer:

The answer is $64.

Formula for simple Interest is P x R x T/100. Which is $8000 x 8 x 1/100 = $64

four triangles are formed by joining the midpoints of three sides of an equilateral triangle

Answers

Answer:

all are congruent

Step-by-step explanation:

Four triangles are formed by joining the mid points of the three sides of a triangle then all are congruent as sides of all triangles will be same as they are formed by joining the mid points.

50 POINTS AND BRAINLIEST IF IT INCLUDES STEPS

Create and solve a multi-step equation WORD PROBLEM that includes at least THREE STEPS (three or
more mathematical operations), that will have a final answer of 12. THE EQUATION MUST INCLUDE A
VARIABLE

Answers

Answer:

3(x-6)+9=27

Step-by-step explanation:

1. Multiply 3 to x-6

3x-18+9=27

2. add -18 and 9

3x-9=27

3. add 9 to 27

3x=36

4. Divide 36 and 3

x=12

Question 1: Last Friday Trevon had $29. Over the weekend he received some money for cleaning the attic. He now has $41. How much money did he receive? Your response should include: The answer to how much money Trevon received AND your reasoning for your answer, with a focus on writing as complete of sentences as you can.

Question 2: Jenny wants to buy a game that costs $30.98. How much change does she receive if she gives the cashier $40?Your response should include: The answer to how much change Jenny will receive back AND your reasoning for your answer, with a focus on writing as complete of sentences as you can.

I WILL CHECK BEFORE GIVING POINTS, I REALLY NEED THIS THANK YOU :)

Answers

Answer ¹ ↷$ 12

Solution ↷

The amount of money Trevon had last Friday⇢$29

The total amount of money he has after cleaning the attic⇢$41

So,

The amount of money he received after cleaning the attic ⇢ Total money he has after cleaning the attic - The money he had last Friday

⇢ $41-$29⇢$12

Thus ,he received $ 12 for cleaning up the attic.

Answer²↷$9.02Solution ↷

The cost of the game ⇢$30.98

The amount of money she gave to the cashier ⇢$40

The amount she'll receive back⇢ the amount of money she gave to the cashier - the cost of the game

⇢$ 40 - $ 30.98⇢$ 9.02

Hence , she'll receive $ 9.02 back from the cashier.

Answer:

Question 1

Given:

Last Friday Trevon had $29He received money for cleaning the atticHe now has $41

To calculate the money Trevon received for cleaning the attic over the weekend, we need to find the difference between the money he started with and the money he now has. To find the difference, subtract the smaller number from the bigger number:

⇒ Money Trevon received = Money he has now - money on Friday

= $41 - $29

= $12

Therefore, Trevon received $12 for cleaning the attic over the weekend.

Question 2

Given:

Cost of game = $30.98Money gave the cashier = $40

To calculate the change Jenny received from the cashier, we need to find the difference between the two amounts. To find the difference, subtract the cost of the game from the money Jenny gave to the cashier:

⇒ Change = money given - cost of game

= $40 - $30.98

= $9.02

Therefore, Jenny received $9.02 in change from the cashier after paying for a game that costs $30.98 with $40.

What are the zeros of this function?
5
O A. x = 0 and x = 2
O B. x = 0 and x = -4
O c. x= 0 and x = 4
O D. x = 2 and x = -4
PLEASE HELPPP
THANK YOUUU

Answers

Answer:

At origin x-axis and y-axis are Zeros and when the the will at x-axis then y-axis wil zero so,

C is the right answer

In 2010, a city’s population was 49,339 and it was declining at a rate of 1.06% each year.

Which is the best prediction for when the city’s population will first be below 35,000?

2036

2039

2042

2045

Answers

Answer: the answer is 2042 or C

Step-by-step explanation:

Answer:

2042

Step-by-step explanation:

took the test

what is the distance between these two numbers -3 1/4 and 4 1/2

Answers

Answer:

7 3/4

Step-by-step explanation:

Method 1:

Step 1: Instead of subtracting you distribute the minus sign to the number in the parenthesis

4 1/2 - (-3 1/4) = 4 1/2 + 3 1/4

Step 2: Then you can just add

4 1/2 + 3 1/4= 7 3/4

Method 2:

If you dont know fractions transfer them into decimals. 1/2 = 0.5 and 1/4 = 0.25

Step 1: Instead of subtracting you distribute the minus sign to the number in the parenthesis

4.5 - (-3.25) = 4.5 + 3.25

Step 2: Add the numbers

4.5 + 3.25= 7.75

Step 3: Convert the decimal back into a fraction

7.75= 7 3/4

find the volume of the prism

Answers

[tex] \huge\fbox\orange{ANSWER} [/tex]

[tex] \mathsf \purple{v = l \times w \times h}[/tex]

[tex] \mathsf \pink{v = 8 \times 2 \times 5}[/tex]

[tex] \mathsf \purple{v = 80 \: cubic \: units} [/tex]

Answer:

80 cubic units

Step-by-step explanation:

Given

Height = 5 unitsLength = 8 unitsWidth = 2 units

Volume = Length x Width x Height

V = 8 x 2 x 5V = 40 x 2V = 80 cubic units

please help me with this question

Answers

Answer:

119

Step-by-step explanation:

64 + 23 + 32

119 I think

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