A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 60 cm/s. Required:
a. Express the radius r (in cm) of this circle as a function of time t (in seconds).
r(t) = cm

b. If A is the area of this circle as a function of the radius.
Find A ∘ r.
(A ∘ r)(t) =

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

its the second choice.

step-by-step explanation:

the elements in the range will be 7 less than the elements in the domain.

i dont know

step-by-step explanation:

umm. i dont know

yes they are the same