The table shows the numbers of cellular phone subscribers S (in millions) in the United states from 1999 through 2004, where t represents the year, with t = 9 corresponding to 1999. Use the regression feature of a graphing utility to find a linear model for the data. Use the model to find the year in which the number of subscribers exceeded 200 million.

Which best describes the strength of the correlation, and what is true about the causation between the variables? it is a weak negative correlation, and it is not likely causal. it is a weak negative correlation, and it is likely causal. it is a strong negative correlation, and it is not likely causal. it is a strong negative correlation, and it is likely causal.

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

Which expression is equal to (f+g)(x)?