Question #7b5d6

1 Answer
Meave60
Sep 22, 2015

#a) 15.1+75.32=90.4#

#b) (5.50xx10^8) * (4xx10^5)=2xx10^14#

#c) 5.672xx10^(-6)+7.785xx10^(-6)=1.346xx10^(-5)#

#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#. To round to two significant figures, you need to use scientific notation. #100# would have only one significant figure, and #104# would have three significant figures. But #1.0xx10^2# has two significant figures.

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