Question

I will mark brainiest if you answer ty also you can answer one of them or both tysm i will mark brainliest for both

Answer 1

Step-by-step explanation:

a) The total cost C is given by

$C = \ 60n + \ 40$

b) If the total cost is $400, then we can solve for the number of hours as

$\ 400 = \ 60n + \ 40 \Rightarrow \ 360 = \ 60n$

Solving for n, we get

$n = \dfrac{\ 360}{\ 60} = 6\:\text{hrs}$