4 years ago

37. Two years ago, Bob flew 6 x 105 miles in an airplane. This was 15 times as many

Mathematics

1 answer:

gogolik [260]4 years ago

3 0

Answer:

A. 4·10⁴

Step-by-step explanation:

The problem statement tells you ...

6×10⁵ miles = 15 × (last year's mileage)

Dividing by 15 gives ...

(60×10⁴ miles)/15 = (last year's mileage) = 4×10⁴ miles

_____

Further explanation

An exponent is an indication of repeated multiplication.

10⁵ = 10·10·10·10·10 = 100,000

We can use the associative property of multiplication to rewrite the number of miles:

6×10⁵ = 6·(10·10·10·10·10) = 600,000 = (6·10)·(10·10·10·10) = 60×10⁴

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