What critical value of t* should be used for a 95% confidence interval for the population mean based upon a random sample of 20 observations? Find the t-table here.

t* = 1.725
t* = 1.729
t* = 2.086
t* = 2.093

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)