Multiply (2.0 ⋅ 10^−4) ⋅ (3.1 ⋅ 10^−20). express the answer in scientific notation

If a is a nonzero real number then the reciprocal of a is

What is the cube root of -1,000p^12q3? -10p^4 -10p^4q 10p^4 10p^4q

Amanufacturer knows that their items have a normally distributed lifespan, with a mean if 9.1 years, and standard deviation of 2.9 years. if you randomly purchase one item, what is the probability it will last longer than 10 years?