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Algebra 1 3

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Algebra 1 3

1. 1. EXAMPLE 2 Evaluate an expression Movies The total cost of seeing a movie at a theater can be represented by the expression a + r 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.
2. 2. EXAMPLE 2 Evaluate an expression SOLUTION Total cost = a + r Write expression. = 7.50 + 7.25 Substitute 7.50 for a and 7.25 for r. = 14.75 Add. ANSWER The total cost is \$14.75
3. 3. 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 b. 52 five to the second power, 5 5 or five squared 1 3 1 1 1 c. one half to the third power, 2 2 2 2 or one half cubed d. z5 z to the fifth power z z z z z
4. 4. GUIDED PRACTICE for Examples 2 and 35. WHAT IF? In Example 2, suppose you go back to thetheater with a friend to see an afternoon movie. You payfor both admissions.Your total cost (in dollars) can berepresented by the expression 2a. If each admissioncosts \$4.75, what is your total cost?ANSWERThe total cost is \$9.50.
5. 5. GUIDED PRACTICE for Examples 2 and 3Write the power in words and as a product.Power Words Product6. 95 Nine to the fifth power 9 9 9 9 97. 28 Two to the eighth power 2 2 2 2 22228. n4 n to the fourth power n n n n