Cant get wrong

jason is training for a marathon bike ride. his average speed increased from 3 miles per hour to 6 miles per hour in 3 months. find the rate of change in the miles per hour that jason bikes. a) .5 mile per hour per month b) 1 mile per hour per month c) 2 miles per hour per month d) 3 miles per hour per month

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 california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.