Where is the circumcenter of any given triangle?
a. the point of concurrency of the altitudes of the triangle
b. the point of concurrency of the perpendicular bisectors of the sides of the triangle
c. the point of concurrency of the bisectors of the angles of the triangle
d. the point of concurrency of the medians of the triangle

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18