The table below lists the percent of American workers who responded that they were likely to be laid off from their jobs in the coming year, represented in terms of the number of years since 1990.
Year, x Percent who say Lay-off Likely
1990, 0.......................16
1997, 7.........................9
2010,20.......................21
a) Fit a quadratic function f 1x2 = ax2 + bx + c to the data, where x is the number of years since 1990.
b) Use the function to estimate the percent of workers who responded that they were likely to be laid off in the coming year in 2003.