4(1-6v=-8(-7-4m) what is the work and answer

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¯¯¯¯¯¯¯¯)?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?