Please help me. I will give brainliest.

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Factor the polynomial. b^2 + 4b + 4