# calc -rates

posted by
**daryl** on
.

assume a circle is expanding with time where r= t+3. What is the formula for rate of change of an area of the circle with reswpect to time?

posted by
**daryl** on
.

assume a circle is expanding with time where r= t+3. What is the formula for rate of change of an area of the circle with reswpect to time?