A theater group is made up of 21 girls and 24 boys. Fifteen of the girls and 12 of the boys are also in a photography club. What percent of the theater group is also in the photography club?

pls help :)

Graph the equation. select integers for x

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

Precalculus question, image attached.