Write a function and solve for the total loan amount of an initial loan
of $24,520 with an interest rate of
3% for 10 years.

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).