Please help quick quick

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

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me

Robert is placing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other area is 5.7 feet. the sod costs y dollars per square foot