Question

A circular oil slick is expanding with radius, r in feet, at time t in hours given by r=12t−0.3t2, for t in hours, 0≤t≤10.
Find a formula for A=f(t), the area of the oil slick as a function of time.

A=f(t)=

Answer 1

Area of a circle = pi*r^2

Answer 2

correct

Answer 3

and r=12t−0.3t2,

Answer 4

u wrong dannyboi

Answer 5

so how can you get Area in terms of only time

Answer 6

u wrong dannyboi

Answer 7

i already tried putting the R equation into the area equation

Answer 8

thats all there is

Answer 9

whats you r final expression for area?

Answer 10

pi(12t-0.3t^2)^2

Answer 11

u wrong dannyboi

Answer 12

okay u can expand the brackets too

Answer 13

?

Answer 14

expand (12t-0.3t^2)^2

Answer 15

how?

Answer 16

0.09t^4−7.2t^3+144t^2

Answer 17

?

Answer 18

yeah

Answer 19

try doing 3.14* for pi

Answer 20

u wrong dannyboi

Answer 21

didnt work

Answer 22

you need units in your formula?

Answer 23

enter units dude

Answer 24

like what ft or hrs?

Answer 25

yeah this is area as a function of time so

Answer 26

where should i put it?

Answer 27

ft^2

Answer 28

i dunno click on that help with units button and see the format

Answer 29

it says hr for hour and ft for feet so

Answer 30

k so do ft^2

Answer 31

:D thanks man

Answer 32

np :)