Question

Calc help! Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 7.5 mi2/hr. How rapidly is radius of the spill increasing when the area is 5 mi2?

Answer 1

i think we just need to deal with a circle
related rates ? right

equation for area of a circle is \[\large\rm A=\pi r^2\]
take the derivative
and then substitute values