Please tell me what to do like tell me the answers like 1.answer 2.answer and thank you I’ll give you a lot of coins just please help me fast

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¯¯¯¯¯¯¯¯)?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

What is the sum of these mixed numbers 4 2/3+ 3 1/9