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Big Idea Because of the relationship between repeated multiplication and powers, products & powers of powers can be themselves written as powers. Product of Powers Property m n For all m and n, and nonzero b, b · b =b m+n . Power of a Power Property m n For all m and n, and all nonzero b, (b ) mn =b . Warm-Up 1. Write 2 xas a decimal when x is an integer from 1 to 10. 2. Multiply any two of the first five numbers in your list of answers for Question 1. The product will also be in the list. Why is this? 3. Repeat Questions 1 and 2 with 3x instead of 2x. Does the same pattern hold? Additional Examples 1. A collector started with 2 antique pocket watches, and every year his number of pocket watches doubled. Write an expression for the number of pocket watches the collector has after d years, and then after 5 more years. 2. Simplify w 4· k9 · k 3 · w2 · k. 3. Write (3 8) 3 as a single power. 3 9 4. Simplify 2g(g ) . Big Idea Because of the relationship between multiplication and division, quotients of powers can be themselves written as powers. Quotient of Powers Property m For all m and n, and nonzero b, b = bm-n . n b 1. Evaluate the following. 2. In March 1992, there was a total of 283.9 billion dollars in U.S. currency in circulation. The U.S. population was 252.7 million. How much currency per person was in circulation. 3. Simplify.