1/3(6x+12) -2(x-7) = 19 plz help

Atriangle has vertices of (0,3.5), (3,1.5), (0, -1.5). if it is dilated with center at the origin, and a scale factor of 2, what will be the coordinates of the image?

Alarger number is double the sum of a smaller number. the larger number is 2 less than 3 times the smaller number. if y represents the larger number and x represents the smaller number, which equations model the situation

Multiply and simplify 2x^2 y^3 z^2 · 4xy^4 x^2