Answer:
The cost per costumer is 10 + x
Step-by-step explanation:
I hope this helps! :)
Let x be the first number and y be the second.
2x + y = 25
3x - y =20
1) Add them together.
5x = 45
x = 9
2) Solve for y.
2(9) + y = 25
y=7
3) Check your work on the other equation.
3(9) - (7) = 20
27 - 7 =20
20 = 20
(42)^3 -(24)^3 - (18)^3
= (74,088)-(13,824)-(5,832)
= 54,432