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By pumping the air pressure in a tank is reduced by 15%/second. The percentage of air pressure remaining is fiven by the formula.

p=100(0.85)^t

Plot p against t for 0 < t < 30s.

Deternine the rate of change at 5s & 10s. I have plotted the graph.

Verify you anser via calculus.

Can anyone please advise which formula is applicable to this?