How do you work out the area of a triangle? ​

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

Find the solution of this system of equation -7x+y=-20 9x-3y=36

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6