How do i find a vertex of a parabola

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Closing a credit card usually _your debt ratio. a. increasesb. decreasesc. improvesd. has no effect on

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.