Todd travels frequently for his business. For tax reasons, he wants to use up all of his remaining money in his business travel fund this year. He uses the function f (x) = x^2− 8 x + 16 to determine how many trips he must take to spend all of his remaining business travel funds. In this function, x represents the number of trips and f ( x ) is the amount of money left in his fund after the trips. The discriminant of this quadratic function tells us that his quadratic equation has real solutions

A. none

B. one

C. two

D. three
According to this function, Todd can use all of the remaining money in his travel fund if he takes business trips this year.

A. two

B. three

C. four

D. five