If we put y as the unit of year, the function will be 50000x0.975^y (100%-2.5% is 97.5%). And so from 2001 to 2010, nine years has passed, so the equation will be 50000x0.975^9 And if you calculate and round the answer to the nearest hundredth (cent), you will find $39811.77.
First I converted the equation terms into sine and cosine. and Substitution: Common Denominator Created: Multiply each term by the LCD: Substitution: Recall ⇒ Distribute and collect all terms on one side: Factor and set each factor equal to 0: ⇒ ⇒ The 2nd factor provides only possible answer 109.5 degrees