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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