In the triangle below, ∠Q is a right angle. Which ratio would be equivalent to the ratio of sin∠R? a) cos∠Q
b) cos∠S
c) sin∠Q
d) sin∠S

The circumference of a circle is 5 pi cm. what is the area of the circle?

Rewrite so the subject can be y in the formula d=m-y/y+n

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.