Question

Which number is NOT in scientific notation?

Answer 1

what are the answer choices...?

Answer 2

3.4 × 10^-1

Answer 3

0.4 × 10^5

Answer 4

1.98 × 10^-20

Answer 5

8 × 10^12

Answer 6

all of the above are in scientific notation

Answer 7

but there is no all of above ?

Answer 8

to write a number in scientific notation the format is
a *10^n where a is a number from 1 to 9 and n is real

Answer 9

oh yeah sorry haha it would be B. Properly written it should be 4.0 * 10^4 not .4 * 10^5

Answer 10

thank you

Answer 11

self-correction: the 1st significant figure ,a , is a number between 0 and 10 namely 1 through 9