Question 1126763
A circle has an initial radius of 0 cm and then the radius begins increasing at a constant rate of 4 cm per second.
:
A)Write a formula that expresses the radius of the circle in cm, r, in terms of the number of seconds t since the circle started growing.
 r = 4t
B)Write a formula that expresses the area of the circle in square cm, A, in terms of the radius of the circle in cm, r.
 A = {{{pi*r^2}}}
C)Write a formula that expresses the area of the circle in square cm, A,in terms of the number of seconds t since the circle started growing
 A = {{{pi*(4t)^2}}}
D)Write your answer to part (c) in expanded form - so that your answer does not contain any parentheses.
 A = {{{pi*16t^2}}}