Help me with this Calculus problem

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5