(95).A pebble thrown into a pond causes circular ripples to radiate outward. If
the radius of the outer ripple is growing by 2 feet per second, how fast is
the area of its circle growing at the moment when the radius is 10 feets?
(94).The rate of change in sales for Wal-Mart from 1991 through 2000 can be
modeled by ds/dt = 2.38t+10.8/t where s is the sales(in millions) and t=1
corresponds to 1991. In 1992, the sales for Wal-Mart were $55484 million.
(a) Find a model for sales from 1991 through 2000.
(b) Find Wal-Mart's sales in 1998.
(93). Approximate sin(0.3) accurate to the 4^th decimal place. Give the maximal
possible error.
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