Question

In standard form, the number 72105.4 is written as 7.21054 × 10ⁿ, where n is equal to ______.

Options

• 2

• 3

• 4

• 5

Answer 1

In standard form, the number 72105.4 is written as 7.21054 × 10ⁿ, where n is equal to 4.

Explanation:

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 × 10⁴