Hi I’m Venesa I’m 15 and I’m single and I’m bad at math

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet