Taking a test pls help!!

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

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¯¯¯¯¯¯¯¯)?

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab