When subtracting 3x2 + 4x + 9 from 15x2 + 6x - 12, which TWO choices are correct?

Asap! will mark brainliest! ( respond asap, it's urgent! : )) what is the slope for equation y =-3x + 8

40 points which is the equation of a line perpendicular to the line with the equation: y = 1/4x + 2 a : y = -4x - 7 b : y = 4x + 2 c : y = 1/4x - 1/2 d : y = -1/4x + 3

Thomas buys a cardboard sheet that is 8 by 12 inches. let x be the side length of each cutout. what is the size of the cutout he needs to make so that he can fit the most marbles in the box?