Mark partially drained his pool to clean it. At 1:00 P. M., he started to refill it. At 5:00 P. M., the pool had 10,400 gallons of water. At 9:00 P. M., the pool had 13,800 gallons of water. If filling the pool is modeled by a linear function, how many gallons of water still remained in the pool when he first started to refill it?

A) 6,150
B) 6,500
C) 7,000
D) 7,150

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.