1] A spherical balloon is being filled with air at the constant rate of 2 cm'1 fsec. How fast is the radius changing when the radius is 3 cm? Note: formula for the volume of a sphere is V = :rr3 3 2] Given that y = 2x2, find dxwhen x = 2 and d_y = 1 dr dt 3) Two planes are flying in the air at the same height. Airplane A is flying east at 250 miles per hour and Airplane B is flying north at 300 miles per hour. if they are both heading to the same airport, located 30 miles east of Airplane A and 40 miles north of airplane B, how fast is the distance between the airplanes changing