Free points and if u lucky a

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Need showing work for this problem 56.25 ×25.80