Turning points
F(x)=0.0156x^4-0.4992x^2-2

the radius is 2 times the diameter.

step-by-step explanation:

1/4 is the asnwer cuz 5/20 is the faction

graph #4 (last graph) depict the function   f(x)= -m(x-d)^1/5 i

step-by-step explanation:

we know that

m=slope

but in this function slope is -m that means slope is decreasing and it is decreasing by 1/5 points down the x-axis.

which is shown in graph four

a decreasing slope down x-axis by 1/5 points.

hence 4th graph is the right option for this.

answer is  

d.

all of the above

hope you get this right