Question

Which number is not in scientific notation? 9 ⋅ 1019 7.8 ⋅ 106 1.45 ⋅ 10−7 0.33 ⋅ 10−15

Answer 1

you need a number other than 0 on the left side of the decimal point

 so 0.33*10-15 is not in scientific notation

Answer 2

Answer: D

Hope It Helps :)