Write and solve an equation to find the unknown side length x (in inches). Perimeter =24.2 in. The sides are 8.3, 3.8, 8.3, then x. An equation is__=24.2
The x is__

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

What is x3+3x2−16x−48 divided by x−1?

Can anyone me get through my algebra 2 class? the only class i need to graduate..