How do I solve this?

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mariateresa mariateresa

01-11-2017
Mathematics

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How do I solve this?

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In scientific notation, what is the sum of 2.3 times 10^{-3} and 5.4 times 10^{-4}?a. 2.84 times 10^{-3}b. 5.63 times 10^{-3}c. 7.7 times 10^{-7}d. 12.42 times

mathstudent55 mathstudent55 · Answer 1 · 2017-11-01T05:09:41+01:00

mathstudent55 mathstudent55

01-11-2017

First, you isolate the absolute value.

4 + 8|2b| = 84

8|2b| = 80

|2b| = 10

Now to solve the absolute value part, set what is inside the absolute value equal to 10 and set it equal to -10 and solve both equations.

2b = 10 or 2b = -10

b = 5 or b = -5

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