### Home > CAAC > Chapter 12 > Lesson 12.1.1 > Problem12-7

12-7.

Anything to the zero power equals 1.

When multiplying like bases, add their exponents.

20x −1 = ?

$\frac{20}{x}$

See the 'step' in part (b).

Rewrite the expression as multiplication three times.
Then follow the steps in part (b).