## anonymous one year ago BOOM

1. anonymous

@phi @ganeshie8 @dan815 @DanJS @Hero @Prosper2win

2. anonymous

@welshfella @Elsa213 @RedNeckOutLaw @taramgrant0543664 @yomamabf @uybuyvf @OGKeith

3. phi

Find the area of the circle of spilled paint as a function of time, or A[r(t)]. to do that , start with the formula for the area $A = \pi \ r^2$ now erase the r and put in its place (3t) can you do that ?

4. anonymous

A=π3t^2

5. anonymous

Part A: π(3t)^2 (3.14)(9)(t^2) 28.26t^2 Part B: 28.26 x 10^2=2826 I got this but i don't know if its right

6. phi

almost. remember that "3t" is r so you should put in parens (3t)^2 (which means 3*t*3*t or 9*t*t or 9*t^2)

7. anonymous

so Part A: π(3t)^2 (3.14)(9t^2) 28.26t^2

8. phi

yes. all of that looks ok but they may want you to leave it as pi in part A (that is more accurate way to show the formula) so $A(t)= 9 \pi t^2$

9. phi

in part B they say you can use 3.14 , so now you can do A(10)= 9*3.14*10^2 which will simplify to your answer 2826

10. anonymous

Oh ok so i will just write it both ways

11. anonymous

Thank you so much!! :)