50% of what number is 65?

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¯¯¯¯¯¯¯¯)?

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9