Question

According to the Wall Street Journal, 14,200,000 videotape copies of Walt Disney's Fantasia have been sold to date. Write that number in scientific notation.

a. 142 × 1,000,000
b. 1.42 × 107
c. 1.42 × 106
d. 142 × 107

Answer 1

D..

Explanation:

Long story short, do the math and you’ll find the answer, example:

10^7 is 10 x 10 x 10 x 10 x 10 x 10 x 10 is 10,000,000, you multiply that by 1.42, that gives you 14,200,000 copies...Bam

Answer 2

b) 1.42 x 10⁷

All scientific notation must be a number between 1 and less than 10 times a power of ten.
Therefore answers a and d are out because 142 is not a number between and less than 10.
c) is incorrect because it does not move the decimal point enough places to the right.