Guys me me ! subtract. simplify your answer and type it in the box. use a hyphen to show a mixed number and a slash (/) to show a fraction. do not add any spaces. (ex., 4\frac{2}{3}\: =\: 4-2/3423=4−2/3)

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¯¯¯¯¯¯¯¯)?