9514 1404 393
Answer:
4. m = 3, n = 7
5. a) 2.0272; b) 72.4; c) 372
Explanation:
4. 56 = 8×7 = 2^3 × 7
Comparing to 2^m × n, we see that m=3, n=7.
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5. It's all about scale factors. One way to work this problem is to write all of the numbers in terms of the numbers of the original "given."
a) 0.724 × 2.8 = (724×10^-3) × (28×10^-1) = 20272×10^-4
0.724 × 2.8 = 2.0272
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b) 202.72 ÷ 2.8 = (20272×10^-2) ÷ (28×10^-1) = 724×10^(-2-(-1)) = 72.4
202.72 ÷ 2.8 = 72.4
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c) 20272 ÷ 56 = (20272 ÷ 28) ÷ 2 = 724 ÷ 2 = 362
20272 ÷ 56 = 372