When we add or subtract angles, the result is called a compound angle. For example, \(30^\circ + 120^\circ\) is a compound angle. Using a calculator, we find: ...

Solve the equation \(5\cos (6x - 20)^\circ + 3 = 7.25\), for \(0 \le x \le 180\).

The simple interest formula isn't as complicated as the compound formula below. A savings account is an account that earns interest with a financial institution. Let's say you invested $10,000 in ...