The length of a rectangular lot is 5 feet please help me

What is the length of the unknown leg in the right triangle ?

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

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?