What number should be added to 189 to get a sum of 8502

Which best explains why this triangle is or is not a right triangle?

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.