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ki77a [65]
3 years ago
12

Select all of the equations that have a solution of 4.

Mathematics
2 answers:
just olya [345]3 years ago
8 0

Answer:

A, D

Step-by-step explanation:

A. 5x = 20

divide by 5 on both sides

x = 4

D. x/2 = 2

multiply both sides by 2

x = 4

B and C would equal -4

E would equal 64

skelet666 [1.2K]3 years ago
5 0

Answer:

a and d

Step-by-step explanation:

5x = 20

5/5x = 20/5

x = 4

8x = -32

x = -4

-4x = 16

x = -4

x/2 = 2

2*x/2=2*2

x = 4

x/4 = 16

4*x/4 = 16*4

x = 64

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Helena had a balance of $14.48 left on a gift card. She bought a muffin each for her, and five of her friends. The cost of each
Ivenika [448]
She spent $6.12 on the muffins for her and her friends, and she has $8.36 left on her gift card. By multiplying 6 by $1.02, you get the amount she spent, and by subtracting $14.48 by $6.12, I find how much she has left on her gift card.
8 0
3 years ago
I have corner points of:
WARRIOR [948]
The points you found are the vertices of the feasible region. I agree with the first three points you got. However, the last point should be (25/11, 35/11). This point is at the of the intersection of the two lines 8x-y = 15 and 3x+y = 10

So the four vertex points are:
(1,9)
(1,7)
(3,9)
(25/11, 35/11)

Plug each of those points, one at a time, into the objective function z = 7x+2y. The goal is to find the largest value of z

------------------

Plug in (x,y) = (1,9)
z = 7x+2y
z = 7(1)+2(9)
z = 7+18
z = 25
We'll use this value later. 
So let's call it A. Let A = 25

Plug in (x,y) = (1,7)
z = 7x+2y
z = 7(1)+2(7)
z = 7+14
z = 21
Call this value B = 21 so we can refer to it later

Plug in (x,y) = (3,9)
z = 7x+2y
z = 7(3)+2(9)
z = 21+18
z = 39
Let C = 39 so we can use it later

Finally, plug in (x,y) = (25/11, 35/11)
z = 7x+2y
z = 7(25/11)+2(35/11)
z = 175/11 + 70/11
z = 245/11
z = 22.2727 which is approximate
Let D = 22.2727

------------------

In summary, we found
A = 25
B = 21
C = 39
D = 22.2727

The value C = 39 is the largest of the four results. This value corresponded to (x,y) = (3,9)

Therefore the max value of z is z = 39 and it happens when (x,y) = (3,9)

------------------

Final Answer: 39

7 0
3 years ago
What is the product of the polynomial (7x+7) (x+2)
kolbaska11 [484]

Answer: 7x^2+21x+14

Step-by-step explanation:

(7x+7)(x+2)

Multiply each term in the first parentheses by each term in the second parentheses (FOIL)

7x×x+7x×2+7x+7×2

↘ ↙

7x×x calculate product

7x^2+7x×2+7x+7×2

↘ ↙

7x×2 calculate product

7x^2+14x+7x+7×2

↘↙

7×2 multiply numbers

7x^2+14x+7x+14

↘ ↙

21x collect like terms

7x^2+21x+14 is your end result.

3 0
3 years ago
What's the surface area ?
Morgarella [4.7K]

Answer:

ans = 112

Step-by-step explanation:

Hope it will help

please mark as brainlists

3 0
2 years ago
Which graph correctly solves the system of equations below? <br> y=-x^2+1 <br> y=x^2-4
KIM [24]
Red line shows
y=x^2-4 , cause it's going through point (0,-4)

So blue line shows
y= -x^2+1 Point (1,0) belong to it , moreover x factor is negative , so the arms of parabola will go down

Have nice evenig :)
Greetings From Poland.
5 0
3 years ago
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