Acircle has an initial radius of 50 ft when the radius begins decreasing at the rate of 5 5 ft/min. what is the rate in the change of area at the instant that the radius is 26 26 ft?

Yvaries inversely as x. y =12 when x=5. find y when x=4

The mountain springs water company has two departments, purifying and bottling. the bottling department received 67,000 liters from the purifying department. during the period, the bottling department completed 65,000 liters, including 3,000 liters of work in process at the beginning of the period. the ending work in process was 5,000 liters. how many liters were started and completed during the period?

Simplify each expression for 18, 20, and 21