Question

what is the exponent when the following number is written in scientific notation? 0.00280

Explanation:

Step1: Rewrite number in scientific notation

Scientific notation requires a number between 1 and 10 multiplied by a power of 10. For 0.00280, move the decimal 3 places right to get $2.80$.
$$0.00280 = 2.80 \times 10^{-3}$$

Step2: Identify the exponent

The exponent of the base 10 is the value we need.

Answer:

-3