Ed owns a brake repair shop. He charges $25 to check brakes. He charges $50 for a new set of brakes. He charges $75 for labor to put a new set of brakes on.
If 5 cars came in today, and 3 of them needed a brake check and the others needed new brakes,
which equation would tell Ed how much money he made?
2(25) + 3(50 +75)
3(50) + 2 + 25 + 75
3(25) + 2(50)
3(25) + 2(50 + 75)

D. 3(25) + 2(50+75)

Step-by-step explanation:

3 cars = check brakes = $25. So, 3x25 or 3(25)

2 cars = new brakes = $50 + $75. So, 2(50+75)

Add the two semi-totals together: 3(25) + 2(50+75)

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional