Question

What is the product of 2.5 × 10−15 and 3.9 × 1026?

Answer 1

We want the product of
2.5 × 10^−15 * 3.9 × 10^26

We multiply 2.5 * 3.9 which equals 9.75 then we add the exponents giving us:
9.75 x 10^11