Exam Maths Puzzle Algebra

Solve
-4w^2+7w-3

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Exam Other Question

The distance D between a fixed spring and the floor is a linear function of the weight w attached to the bottom of the spring. The spring is 12 inches from the floor when the weight is 2 grams, and the spring is 7 inches from the floor when the weight is 4 grams. Write D as a linear function of w. Solve
(x^3-x^2+6x+1)/(x-3)