X - 2y - 3z = -5
-3y – 2z = -12
-3x – y + 2z = -13
row-echolen form

Answer this question! 30 points and brainliest! only if you know the answer.

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2