Question

Express the following number in exponential notation with correct significant figures: 0.00721

a)7.21×10⁻³
b) 7.21×10⁻⁴
c) 7.2×10⁻³
d) 7.2×10⁻⁴

Answer 1

The number 0.00721 is correctly expressed in exponential notation with significant figures as 7.21×10⁻³.

Step-by-step explanation:

The number 0.00721 expressed in exponential notation with the correct significant figures is 7.21×10⁻³. This is because exponential notation involves writing numbers as a product of a number between 1 and 10, and a power of 10.

In this case, we move the decimal point three places to the right, which gives us the base number 7.21, and is then multiplied by 10 raised to the power of -3 to show the original decimal placement in the number.