PSAT10 P1 · 第 17 题

A model predicts that a certain animal weighed 241 pounds when it was born and that the animal gained 3 pounds per day in its first year of life. This model is defined by an equation in the form f(x) = a + bx , where f(x)  is the predicted weight, in pounds, of the animal x days after it was born, and a and b are constants. What is the value of a ?