Found the problem:
Item Cost Sales Price
T-shirt 6 10
hats 4 7
Let x = t-shirts, y = hats
6x + 4y = 2,000
10x + 7y = 3,375
4y = 2000 - 6x
y = 2000/4 - 6x/4
y = 500 - 3x/2
10x + 7y = 3,375
10x + 7(500 - 3x/2) = 3,375
10x + 3500 - 21x/2 = 3,375
10x - 10.5x = 3,375 - 3500
-0.5x = -125
-0.5x / -0.5 = -125/-0.5
x = 250 shirts
They will need 250 shirts.
Answer: A
Step-by-step explanation:

We need to get this form: 
we need to begin by isolating y on the left side. To do this, we must subtract 4x.

Rewrite it so that we get this form: 

Since y needs to be completely isolated, divide by 4.

Divide;

SA=201.7cm^2
I used the equation
SA=pi^1/3(6*V)^2/3 in case you have any more questions like this
Answer:
a = 7 + 2b/5 + 3c/5
b=−35/2 + 5a/2 − 3c/2
c = −35/3 + 5a/3 − 2b/3
Step-by-step explanation:
Yes