Question: I need help with these two questions 8 . A spherical balloon is filling with helium at the rate of 4 ft'/min. At what rate

I need help with these two questions

8 . A spherical balloon is filling with helium at the rate of 4 ft'/min. At what rate in ft/min is the radius creasing at the instant that the volume is ft 3 3 9 . Two cars start at the same intersection and travel away from each other at right angles. One of them is raveling at the rate of 40 mph and the other at 32 mph. How fast in mph are the two separating 90 mins later? the following

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