2/3 times 6/7 divided by 2/5

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¯¯¯¯¯¯¯¯)?

4+(2+x) can you me solve this problem

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?