What is the slope between points (-1,2) and (4,2)

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

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