One pipe fills a storage pool in 8 hours. a second pipe fills the same pool in 4 hours. when a third pipe is added and all three are used to fill the pool, it takes only 2 hours. find how long it takes the third pipe to do the job

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

Yvaries directly as x. y =90 when x=6. find y when x=13

Darragh has a golden eagle coin in his collection with a mass of 13.551\,\text{g}13.551g. an uncirculated golden eagle coin has a mass of 13.714\,\text{g}13.714g.