A spinner has 20 ​equal-sized sections. Fifteen of the sections are blue. a. What is the probability that the spinner will land on blue​? b. Use words to describe the probability.

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

The reflexive property of congruence lets you say that ∠pqr ≅

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?