The parallel lines are marked with "feathers". find the measures of the angles located at positions a, b, c, d, e, & f.

Solve 2x+y=3 x+y=5 in substitution method

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.