If f'(x) = ln (x-2), then the graph of y=f(x) is decreasing if and only if
a) 2 b) 0 c) 0 d) x> 1
e) x> 2

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¯¯¯¯¯¯¯¯)?

Which expression is equivalent to the expression shown?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees