Answer !

john's car is stopped at a red light. when the light changes, the car accelerates to 45 miles per hour in 15 seconds.
what is the approximate rate of change in the miles per hour that john's car accelerated?
a)
3 miles per hour per second
b)
12 miles per hour per second
c)
15 miles per hour per second
d)
30 miles per hour per second

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.