Question #7b5d6

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Question #7b5d6

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Answer 1 · 2015-09-22T03:26:15

$a) 15.1 + 75.32 = 90.4$ $a) 15.1+75.32=90.4$

$b) (5.50 \times 10^{8}) \cdot (4 \times 10^{5}) = 2 \times 10^{14}$ $b) (5.50xx10^8) * (4xx10^5)=2xx10^14$

$c) 5.672 \times 10^{- 6} + 7.785 \times 10^{- 6} = 1.346 \times 10^{- 5}$ $c) 5.672xx10^(-6)+7.785xx10^(-6)=1.346xx10^(-5)$

$d) 45.32 \times 2.3 = 1.0 \times 10^{2}$ $d) 45.32xx2.3=1.0xx10^2$

Explanation:

A and C: When adding or subtracting, look for the number with the fewest decimal places and round the result to the same number of decimal places.

Note on C: When adding numbers in scientific notation, the exponents must be the same.

B and D: When multiplying or dividing, look for the number with the fewest significant figures and round the answer to the same number of significant figures.

Note on D: The answer was $104.236$ $104.236$ . To round to two significant figures, you need to use scientific notation. $100$ $100$ would have only one significant figure, and $104$ $104$ would have three significant figures. But $1.0 \times 10^{2}$ $1.0xx10^2$ has two significant figures.

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Question #7b5d6

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