Simplify the expression:
b2–3b+7+5b

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

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

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class