In the year 1995, the average cost of a cellphone could be modeled by -10t2 + 1600 where t is the number of years since 1995. By the year 2009 the average cost had changed, so it could be modeled by -18t2 + 800.
Find the difference in the average costs for a cellphone between 2009 and 1995.

The coordinates of a, b, and c in the diagram are a(p,4), b(6,1), and c(9,q). which equation correctly relates p and q? hint: since is perpendicular to , the slope of × the slope of = -1. a. p - q = 7 b. q - p = 7 c. -q - p = 7 d. p + q = 7

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.

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box