Salim bought a dvd recorder for $280 now it is on sale for $220 find the percent of change in the price from the nearest whole percent

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

Polynomial that can be factored as (3x-4)(3x+4)

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