Posted by **Matthew** on Tuesday, March 6, 2012 at 7:09pm.

Verify if these are correct answers.

1. The derivative of f(x)=e^2x -e^-2x

is f'(x)=2e^2x - 2e^-2x?

2.A certain radioactive substance is decaying so that at time t, measured in years, the amount of the substance, in grams, given by the function f(x)=3e^-3t. What is the rate of decay of the substance after half a year?

Answer: -3.24g/year?

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