Paul rolled a number cube. What is the
probability he will roll a 5 or 6?

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.