Please help with right answers xoxo

What is the solution to the equation 9^(x+1) =27

Which of the choices shown could be used to prove that aacp=abcp ?

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1