Identify the type of observational study described. a researcher plans to obtain survival rate data for patients whose cancer has gone into remission by following them for the next five years.

retrospective

cross-sectional

prospective

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.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?