For Exercises 13.18 to 13.20, see pages 670–671; for 13.21 to 13.23, see page 677; for 13.24, see page 679.
13.20 LinkedIn members.
Refer to the quadratic fit shown in Figure 13.24 (page 668) for the number of LinkedIn members by quarter. The series ended on the second quarter of 2014. Provide a forecast for the number of members for the third and fourth quarters of 2014.