Iknow i have to prove that it's a parallelogram first, but how do i go about it?

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.

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

What is the absolute value of the complex number -4-sqrt2i