Please answer correctly

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¯¯¯¯¯¯¯¯)?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

How many 3/8s are in 6 plz someone tell me now