Allie is playing basketball. She takes a shot 25 ft away from the basket. When the ball is 4 ft away from her, it is at a height of 10 ft above the floor. The ball reaches its highest height of 18 ft above the floor when it is 12 feet away from her.
a. Find the value of a
b. If the hoop is 10 ft high, how close would Allie have to be in order to make the basket?
a. The value of a is