9 - x2 + 2xy - y2
Factorise

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

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq