What type of triangle is formed by joining the points D(7, 3), E(8, 1), and
F(4, -1)?

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)

Sketch one cycle if the cosine function y=2cos2theta

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.