Question

How many times greater is 8.4 x 10-^5 than 2.1 x 10^-6?

a.
0.04
b.
0.4

c. 4
d. 40

Answer 1

40

Explanation:

`(8.4\cdot 10^(-5))/(2.1\cdot 10^(-6))=(8.4)/(2.1)\cdot 10^(-5-(-6))=4\cdot 10^1=40`

8.4×10^-5 is 40 times the value of 2.1×10^-6