Please can you help me , I couldn't figure it out

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

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i