Can someone help me pls asap

thx and have a good day

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¯¯¯¯¯¯¯¯)?

How do you solving the solution of each system using elimination?

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)