Is the number written in scientific notation? if not, explain.
a. 0.15 x 104
b. 7.06 x 10−8
c. 3.3 x 10012

Scientific notation is a method to write numbers with many digits in a more summarized way.
 A number written in scientific notation follows the following pattern:
 m x 10 ^ e
 The number e is the order of magnitude, the number m must be greater than or equal to 1 and less than 10.
 The following numbers are written in scientific notation:
 a. 0.15 x 104 
 b. 7.06 x 10-8
 The following numbers are NOT written in scientific notation:
 c. 3.3 x 10 ^ 012
 Because they do not follow the pattern mentioned.

Looks pretty good to me!