The radius of a spherical soap bubble is increasing at the rate of 0.2 cm/sec. Find the rate of increase of its surface area, when the radius is 7 cm.

The radius of a spherical soap bubble is increasing at the rate of 0.2cm/sec. Find the rate of increase of its surface area, when the radius is 7cm. ( pi=3.141 approx)

The radius of a spherical soap bubble is increasing at the rate of 0.2cm/sec. Find the rate of increese of its surface area,when the radius is 7cm.

The radius of a spherical soap bubble is increasing at the rate of 0.2 cm/sec. Find the rate of increase of its volume when the radius is 4 cm.

The radius of a soap bubble is increasing at the rate of 0.2cm//s . Find the rate of increase of its surface area when radius = 5 cm.