Triangle PQR has vertices P(-3,-1). Q(-3,-3), and R(-6, -2). The triangle is rotated 90° counterclockwise using the origin as the center of rotation. which graph shows the image, triangle P'Q'R'?

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

b because it contains 40% of the possible results from the random list.  

0,1,2,3 v 4,5,6,7,8,9  

4 integers to 6 integers  

40% success vs 60% fail

step-by-step explanation:

perimeter of the base times height

step-by-step explanation: