Chapter A4, Problem 8E

Help me please

A/ Rewrite the following expression in terms of exponentials . Write the final result as simply as you can ? Cosh5 x +Sinh5 x+2sec5x B/Solve the equation for x : Cosh x = Sinh x +1/2.

You invest $500 in the stock of a company. The value of the stock decreases 2% each year.  Write a correct model to represent the value of your stock after t  years.    (Remember to include parentheses around the b value, a caret for the exponent, and no spaces in the equation. Example: y=300(1.25)^t )