Find the area of the following polygons: I will mark brainiest and thank u and rate 5 stars

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way