Facebook Membersip The following table gives the approximate number of Fac...

Facebook Membersip The following table gives the approximate number of Facebook users at various times since its establishment early in 2004.

a. Find a quadratic regression model for these data. (Round coefficients to the nearest whole number.) Graph the model, together with the data.

b. Assuming the trend had continued, estimate the number of members at the start of 2010 to the nearest 10 million members.

c. Is the quadratic model appropriate for long-term prediction of the number of members? Why?