Question #42446

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Question #42446

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Answer 1 · 2015-09-21T20:40:46

a) $4.0 \times 10^{2}$ $4.0xx10^2$
b) $14.87 \times 10^{- 9}$ $14.87xx10^(-9)$
c) $53.0991$ $53.0991$

Explanation:

a) $\frac{1200.0}{3.0} = 4.0 \times 10^{2}$ $1200.0/3.0 = 4.0xx10^2$
2 significant figures since $3.0$ $3.0$ is 2 significant figures only.

b) $8.75 \times 10^{- 9} + 6.1157 \times 10^{- 9} = 14.87 \times 10^{- 9}$ $8.75xx10^(-9) + 6.1157xx10^(-9) = 14.87xx10^(-9)$
2 decimal places since $8.75$ $8.75$ contains two only.

c) $178.90456 - 125.8055 = 53.0991$ $178.90456 - 125.8055=53.0991$
4 decimal places since $125.8055$ $125.8055$ contains four only.

You can refer to the following rule:
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Question #42446

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