I have enough money to buy five regular CD's and have $6 left over. However, all the CD's are on sale today, for $4 less than usual. If i borrow $2, I can afford nine of them. How much are the CD's on sale for today?

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.