Question 880494
a) we are given two data points (4, 74.9) and (15, 79)
the slope(m) of the line is (79 - 74.9) / (15 - 4) = 0.372727273
standard form of a line is y = mx + b, pick the first point
74.9 = (0.372727273 * 4) + b
74.9 = 1.490909091 + b
b = 73.409090909
A(t) = 0.372727273 * t + 73.409090909
b) A(20) = 0.372727273 * 20 + 73.409090909
A(20) = 80.863636369 million acres