 Using Grouping Symbols

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Using Grouping Symbols
EXAMPLE 2 Using Grouping Symbols a. (14 + 6) 8 = Add inside parentheses first. = 160 Then multiply. b. 9 8 4 + 8 = 72 4 + 8 Evaluate numerator. 12 = 72 Evaluate denominator. = 6 Divide.

Using Grouping Symbols
EXAMPLE 2 Using Grouping Symbols c [63 ( )] = [ ] Divide inside the innermost set of grouping symbols. = Divide inside brackets. =5 Divide.

The total cost of the visit is \$91.50.
EXAMPLE 3 Using a Verbal Model To find the total cost of the visit to the aquarium described on the previous page, you can use a verbal model to write and evaluate an expression. = Substitute values. = Multiply first. = 91.50 Then add. ANSWER The total cost of the visit is \$91.50.

Evaluate the expression.
GUIDED PRACTICE for Examples 2 and 3 Evaluate the expression. (9 – 4) = (5) Subtract 4 from 9 . = Divide . = 7

Evaluate the expression.
GUIDED PRACTICE for Examples 2 and 3 Evaluate the expression. [(11–1) ] = 3 [(10) 5] Subtract 1 from 11 . Divide inside the innermost set of grouping symbols. = 3 2 = 6 Multiply.

Evaluate the expression.
GUIDED PRACTICE for Examples 2 and 3 Evaluate the expression. 6. 45+19 2 8 64 = 2 8 Add 45 and 19 . 64 = 16 Multiply 2 by 8 . = 4 Divide .

The total cost of the visit is \$1110.
GUIDED PRACTICE for Examples 2 and 3 7. What If? Suppose 50 students go to the aquarium and movie in Example 3. It costs \$35 to park their school bus. Use a verbal model to write and evaluate an expression for the total cost of their visit. = Substitute values. = Multiply first. = 1110 Then add. ANSWER The total cost of the visit is \$1110.