Question

Question 11

In standard form, the number 72105.4 is written as $7.21054\times {10}^n,$ where $n$ is equal to
(a) 2
(b) 3
(c) 4
(d) 5

Answer 1

We know that, if the given number is greater than or equal to 10, then the power of 10 (i.e. $n$) is a positive integer equal to the number of places the decimal point has been shifted.
Hence, $72105.4=7.21054\times {10}^4$

Thus, n = 4 .