Which investment option would an investor opt For if the investment go or to have future security

Is this a polynomial function? i need to know asap

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

If value of cos330° is √3/2 then find tan165°.