1a. A snowball melts so that its surface area decreases at a rate of 0.5 cm/min. Find the rate at which the radius decreases when the radius is 4 cm. (SA = 4r) 1b. A water tank filtration plant is built in the shape of an inverted cone with height 5.2 m and diameter 5 m at the top. Water is being pumped into the tank at a rate of 3 3 1.2 m/min. find the rate at which the water level is rising when there is 8 m of water. (V = r) 3 1c. 2 Find the equations of the tangent lines to the curve y = x - x - the point (3,2). Include a sketch to illustrate your solution. 2 that pass through