They move closer at 28 mph
the biker catches up at 16 mph
10.5
0.475 / .045 = 10.5
I hope this helped
Normallly people want miles per hour or miles/hour
so divvided 420 by 7 =420/7=60/1=60 miles per hour
A vertical stretch of function g(x)=S*f(x), where S is the scale factor.
We are given the scale factor=4, or S=4, so
g(x)=S*f(x)=4*f(x)=4(12x^2+4)=48x^2+16