Posted by **David** on Sunday, September 12, 2010 at 2:59pm.

Which shows the expression below simplified?

(3.6 × 10^15) + (1.8 × 10^12)

a. 3.60018 × 10^15

b. 3.902 × 10^14

c. 3.618 × 10^15

d. 3.6018 × 10^15

- science -
**bobpursley**, Sunday, September 12, 2010 at 3:04pm
To the correct significant digits, none of the answers. For the life of me, I don't understand your teacher on this.

change both to the same power:

3.6E15=3600E12 Now add, or 3601.8E12

or 3.6018E15.

However, using scientific notation,

3.6E15 is not 3600E12 because of the zeroes being added. Only significant digits can be displayed in the digits portion.

- science -
**David**, Sunday, September 12, 2010 at 3:23pm
????? Please help

- science -
**kaylee**, Monday, September 13, 2010 at 6:41pm
35m=_________km

- science -
**kim**, Monday, September 13, 2010 at 6:42pm
scientific notation

78,990

- science -
**Brett**, Friday, August 17, 2012 at 2:48pm
D is the correct answer. Convert to 10^15 and then add. Significant digits for addition key on the decimal point location, so 3.6018 x 10^15 is correct.

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