Plz someone help me I suck at math!!

Answer this question, only if you know the answer. 30 points and brainliest!

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¯¯¯¯¯¯¯¯)?

Which term below correctly completes the following sentence? if a function has a vertical asymptote at a certain x value, then the function is what at that value