Anyone please help me with solving this question. I have no book with me.

06 x 05 =30 Q1. (a) Assume that oil spilled from a ruptured tanker spreads in a circular pattern whose radius increases at a constant rate of 3 ft/s. How fast is the area of the spill increasing when the radius of the spill is 30 ft? (b) A 13 ft ladder is leaning against a wall. If the top of the ladder slips down the wall at a rate of 2 ft/s, how fast will the foot be moving away from the wall when the top is 5 ft above the ground? Q2. (a) The radius of a sphere is measured with a percentage error within 10.06%. Estimate the percentage error in the calculated volume of the sphere. (b) Find the radius and height of the right circular cylinder of largest volume that can be inserted in a right circular come with radius 5 inches and height 8 inches