The table shows the number of students graduating from a high school in selected years. Use a calculator to write a quartic model for the number of graduates in a given year since 1980. Then use the model to estimate the number of graduates in 1992. Answers:
P(x) ≈ −0.04x4 + 1.06x3 − 8.99x2 + 40.05x + 177.92
The estimated the number of graduates in 1992 is 367.

P(x) ≈ 0.14x3 + 1.95x2 − 20.17x − 191.86
The estimated the number of graduates in 1992 is 399.

P(x) ≈ 0.04x4 − 1.06x3 + 8.99x2 − 40.05x − 177.92
The estimated the number of graduates in 1992 is 367.

P(x) ≈ 0.14x3 − 1.95x2 + 20.17x + 191.86
The estimated the number of graduates in 1992 is 367.