The value of 4.2 × 10-15 + 42 × 10-16 + 4.2 × 10-14 is:
5 × 10-14
5.4 × 10-15
5.04 × 10-14
5.04 × 10-15
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Given,
4.2 × 10-15 + 42 × 10-16 + 4.2 × 10-14
Now simplifying:
⇒10−14(4.2×10−1+42×10−2+4.2)⇒10−14(4.2×110+42×1100+4.2)⇒10−14(4.210+42100+4.2)⇒10−14(0.42+0.42+4.2)⇒5.04×10−14.\Rightarrow 10^{-14} (4.2 × 10^{-1} + 42 × 10^{-2} + 4.2) \\[1em] \Rightarrow 10^{-14} (4.2 \times \dfrac{1}{10} + 42 \times \dfrac{1}{100} + 4.2) \\[1em] \Rightarrow 10^{-14} \Big(\dfrac{4.2}{10} + \dfrac{42}{100} + 4.2\Big) \\[1em] \Rightarrow 10^{-14} (0.42 + 0.42 + 4.2) \\[1em] \Rightarrow 5.04 × 10^{-14}.⇒10−14(4.2×10−1+42×10−2+4.2)⇒10−14(4.2×101+42×1001+4.2)⇒10−14(104.2+10042+4.2)⇒10−14(0.42+0.42+4.2)⇒5.04×10−14.
Hence, option 3 is the correct option.
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Which of the following is equal to x?
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5
5\sqrt{5}5
10
1
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2
16
132\dfrac{1}{32}321
32
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0
-1
11
