The mystery number is a four-digit number. its digits are 8, 7, 3, and 5.
• the 5 and the 7 are side-by-side.
• the 5 and the 8 are side-by-side.
• the 8 is the second digit.
what is the mystery number?

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?

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.

Me find the value of x each figure.