Calculus question that i really need answered before 12: 30 am tomorrow. answer a, b, and c if you can you.

the water in a fish tank is decreasing at a rate of 2 inches per hour

Rate of change is the derivative

Rate of change in height with respect to time  is 2 inches per hour

so

(a)

unit is feet^2 so its area

the unit of area is always units^2

so da/dt is the rate of change in area with respect to time

(b)

r is the radius

so dr/dt is the rate of change in radius with respect to time

Radius is decreasing at the rate of  40 cm per minute

(c)

v is the volume . the unit of volume is always cubic units

so dv/dt is the rate of change in volume with respect to time

Volume is decreasing at the rate of  10 meter cube per second

there is no question content here, but you for the free points! : d