Powers, also known as exponents, are a way to shorten long strings of multiplication.
Instead of writing , write which means "multiply four 5s together."
Or how about this for a timesaver: isn't easier to write than ?
any number to the power of zero is 1
means -15 x -15
remember, a negative exponent means to find the reciprocal
remember your order of operations, parentheses before exponents