Which equation is the quadratic variation for the relationship? y varies directly with x^2 and y=36 when x=3

a: y = 1/4x^2
b: y=12x
c: y=4x^2
d: y=x^2+25

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2