. a. Mum the' following mm (justify your mars with calculations). Dena: use 1 , ' the. that three

4. A spherical balloon is inflated with gas at a rate of 8 on3/s. How fast is the radius of the balloon increasing at the instant the radius is 60 an (hint: The volume of a sphere is given by V = Arr 5. Evaluate the' following limit,s Gustify your answers with calculations). Do not use l'Hospital's rule for the first three: 3x2 (a) lim - - 15 (b) lim 4:r2 5T + 2