Answer:
$71
Step-by-step 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!
C(100) = 71
C(x) = .5x+21
Let x= 100
C(100) = .5(100)+21
= 50+21
= 71
