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------------------------------------------------ Which expression has an estimated product of 45?

A. [tex]44.7 \times 2.1[/tex]
B. [tex]7.5 \times 8.4[/tex]
C. [tex]8.7 \times 5.28[/tex]
D. [tex]38.1 \times 7.3[/tex]

To find which expression has an estimated product of 45, let's go through each expression and estimate the product by rounding the numbers:

1. 44.7 × 2.1:
- Round 44.7 to 45
- Round 2.1 to 2
- Estimated product: [tex]\(45 \times 2 = 90\)[/tex]

2. 7.5 × 8.4:
- Round 7.5 to 8
- Round 8.4 to 8
- Estimated product: [tex]\(8 \times 8 = 64\)[/tex]

3. 8.7 × 5.28:
- Round 8.7 to 9
- Round 5.28 to 5
- Estimated product: [tex]\(9 \times 5 = 45\)[/tex]

4. 38.1 × 7.3:
- Round 38.1 to 38
- Round 7.3 to 7
- Estimated product: [tex]\(38 \times 7 = 266\)[/tex]

Based on these estimates, the expression with an estimated product of 45 is 8.7 × 5.28.