and $7.25 for refreshments. Find the total cost. MOVIES

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and $7.25 for refreshments. Find the total cost. MOVIES Example 2 Evaluate an expression in two variables The total cost of seeing a movie at a theater can be represented by the expression where a is the cost (in dollars) of admission and r is the cost (in dollars) of refreshments. Suppose you pay $7.50 for admission and $7.25 for refreshments. Find the total cost. MOVIES r a + SOLUTION Total cost r a + = Write expression. 7.25 7.50 + = Substitute 7.50 for a and 7.25 for r. 14.75 = Add. ANSWER The total cost is $14.75.

Write the power in words and as a product. Example 3 Read and write powers Write the power in words and as a product. Power Words Product a. 71 seven to the first power 7 five to the second power, or five squared 5 • b. 52 2 1 3 c. one half to the third power, or one half cubed 2 1 • d. z5 z to the fifth power z •

WHAT IF? In Example 2, suppose you go back to the theater Guided Practice for Examples 2 and 3 5. WHAT IF? In Example 2, suppose you go back to the theater with a friend to see an afternoon movie. You pay for both admissions. Your total cost (in dollars) can be represented by the expression 2a. If each admission costs $4.75, what is your total cost? ANSWER $9.50

Write the power in words and as a product. Guided Practice for Examples 2 and 3 Write the power in words and as a product. 6. 95 ANSWER nine to the fifth power, 9 • 7. 28 ANSWER two to the eighth power, 2 •

Write the power in words and as a product. Guided Practice for Examples 2 and 3 Write the power in words and as a product. 8. n4 ANSWER n to the fourth power, n •