"A" can solve 90% of the questions in a book and "B" can solve 70% of them. What is the probability that at least one of them would solve a question selected at random from the
book?

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

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl