Question

PLEASE ANSWER ASAP, 25 points if you answer and will get brainliest if you show all work.

If you drive at x miles per hour and apply your breaks, your stopping distance in feet is approximately
$f(x) = x + \frac{ {x}^{2} }{20}$
a)By how much will your stopping distance increase if you increase your speed from 20 mi/h to 30 mi/h?
b)By how much will your stopping distance increase if you increase your speed from 50 mi/h to 60 mi/h?
c)An important driving guideline is that you leave one car length between your car and the car in front of you for every 10 mi/h of speed. Thus, you should leave three car lengths if you are driving at 30 mi/h and 5 car lengths if you are driving at 50 mi/h. Is this guideline consistent with the model f(x)?

Answer 1

Answer is x{f2}=x^25