Akira spent $21 to play 12 demo video games throughout the month. Sony charges $1.25 for new games and $2.75 for older games. Write and solve a system if equations to find out how many new games did akira play.​

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?

Which point has an coordinates of (2,0) ? a

How do i take any fraction and make it into a decimal or percentage?