18. Use Structure Teresa placed parentheses in the expression below so that its value was greater than 80 . Write the expression to show where Teresa might have placed the parentheses. $$ 10.5+9.5 imes 3-1 imes 2.5 $$

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18. Use Structure Teresa placed parentheses in the expression below so that its value was greater than 80 . Write the expression to show where Teresa might have placed the parentheses. $$ 10.5+9.5 	imes 3-1 	imes 2.5 $$

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To make the value of the expression greater than 80, Teresa can strategically place parentheses to alter the order of operations, maximizing the result. Here's how she might do it:

$$
(10.5 + 9.5) \times (3 - 1) \times 2.5
$$

**Breakdown of the Calculation:**

1. **First Parentheses:**  
   $$(10.5 + 9.5) = 20$$

2. **Second Parentheses:**  
   $$(3 - 1) = 2$$

3. **Multiplication:**  
   $$20 \times 2 = 40$$  
   $$40 \times 2.5 = 100$$

**Final Result:**  
$$
(10.5 + 9.5) \times (3 - 1) \times 2.5 = 100
$$

This arrangement ensures that the expression evaluates to **100**, which is greater than 80.
Teresa can place the parentheses as follows to make the expression greater than 80: $$ (10.5 + 9.5) \times (3 - 1) \times 2.5 = 100 $$

18. Use Structure Teresa placed parentheses in the expression below so that its value was greater than 80 . Write the expression to show where Teresa might have placed the parentheses. \( 10.5+9.5 \times 3-1 \times 2.5 \)

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