Question

A vehicle's fuel economy is affected by its speed. The data on Spaller Auto's most popular vehicle is shown in the table below where x is the speed (mph) and F(x) is the fuel economy (mpg). Calculate the rate of change for the interval 40 ≤ x ≤ 50.

A. 5.55 mpg/mph
B. -0.18 mpg/mph
C. -5.55 mpg/mph
D. 0.18 mpg/mph

Answer 1

(34.8 - 33) / (50-400 = 1.8 / 10 = 0.18

Answer 2

For the answer to the question above, the answer to this question is the last one among the given choices which is D. 0.18 mpg/mph
Simply because 
(34.8 - 33) 
(50-400)


1.8 / 10



So the answer is 

= 0.18

I hope my answer helped you. Feel free to ask more questions. Have a nice day!