What's the equation for the length of a rectangle is twice its width the perimeter of the rectangle is 126 feet

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Write a similarity statement for the similar triangles. afgh ~ a

Answer asap! show all work! find the number of complex roots, the possible number of real roots and the possible rational roots of the polynomial function. then, solve for all roots. x^3 + 2x^2 + 3x + 6 = 0