Question

Help! I just don't understand

Answer 1

$71

Explanation:

Since x denotes the number of miles and we know that the car rode 100 miles, this means that x=100, and when we plug this in, we get C(x) = 0.5* 100 + 21 = 50 + 21 = $71. Hope this helps!

Answer 2

C(100) = 71

Explanation:

C(x) = .5x+21

Let x= 100

C(100) = .5(100)+21

= 50+21

= 71