Question

A dripping faucet loses about 2.5×10^−4ters of water each minute. There are approximately 3×10^5 minutes in a month.

Answer 1

2.5 x 10^-4  x 3 x 10^5

2.5 *3 = 7.5

10^-4 x 10^5 ( add the exponents: -4 + 5 =1) = 10^1

so 7.5 x 10^1

Answer 2

That would be
2.5 * 10^-4  * 3 * 10^5  =  7.5 * 10^1