Can I get some help on how to approach this problem?

7. [-11 Points] I DETAILS I LARCALCEUSJJJBQ. I MYNOTES ASKYOURTEACHER I ' An airplane is ying In still air With an airspeed of400 miles per hour. The plane is climbing at an angle of 15. Find the rate at which the plane is gaining altitude. {Round your answer to four deCimal places.) :mm 8. [-13 Points] LARCALCET)' 3.7.014. ASK YOUR TEACHER A spherical balloon is inflated with gas at a rate of 800 cubic centimeters per minute. (a) Find the rates of change of the radius when r: 60 centimeters and r = 95 centimeters. r = 50 cmg'min r : g5 cm/min (b) Explain why the rate of change of the radius of the sphere is not constant even though d'Wdt is constant. 0 3 depends on r2, not simply r. dt 0 The rate of change of the radius is a linear relationship whose slope is g. t d . . . . 0 OT; as a function runs parallel to the volume function, which is not linear. O The rate of change of the radius is a cubic relationship. 0 The volume only appears constant; it is actually a rational relationship