PLEASE HELP I SUCK AT MATH

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

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122