Question

The value, in dollars, of a 1951 bowman willie mays baseball card is given by the function b left parenthesis x right parenthesis equal minus 15 x to the power of 2 plus 450 x plus 325 on the interval 0 less or equal than x less or equal than 24 where x represents the number of years since 1983. what was the value of the card in 1990?

Answer 1

In more conventional notation, ...
  b(x) = -15x² +450x +325 . . . . 0 ≤ x ≤ 24

For 1990, x = 1990 - 1983 = 7
b(7) = -15·7² +450·7 +325 = 2740

The value of the card in 1990 was 2740.