Asporting goods store ordered 144 cans of tennis balls. each can contains 3 balls. how many tennis balls did the store order?

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

The measure of an angle is 117°. what is the measure of a supplementary angle?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?