The coordinates of the vertices of triangles are listed in the options below. which is a right triangle?

d(−2, −3), e(−5, −7), f(6, −7)
a(−3, 2), b(−4, −9), c(8, 1)
p(−6, 2), q(1, 0), r(−3, −2)
x(3, 1), y(−4, −3), z(−8, 3)

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so