Question

Write your answer in scientific notation.

6.4*10^3+1.4*10^4+7.5*10^3

4.2*10^6-1.2*10^5-2.5*10^5
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Answer 1

When you add in scientific notation, all powers if ten have to be the same. In the first equation, just change the 1.4•10^4 into 14•10^3, then add the coefficients
6.4+14+7.5=27.9•10^3
Your answer should be chaged to 2.79•10^4 to keep it in correct scientific notation.
The second problem is dont the exact same way, just subtract