Question

What is the product in scientific notation? (2.5x10^-8)*(9x10^-10)

Answer 1

format for scientific notation
a * 10^n where a is greater than 0 and less than 10 n is an integer
rules of exponents
when you multiply numbers or variables with the same base you add the exponents.
when you divide numbers or variables with the same base you subtract the exponents.
either commutative or associative property for multiplication
you can rearrange the factors that you combine to multiply example (a*b) then *c is the same as a*(b*c) or (a*c) then * b

Answer 2

here group like terms to make it easier
product is what you get when you multiply