4y^2-16 is that a square of the sum, square of a difference, a product of a sum and difference, or not a special product?

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

There are 93 calories in a small candy bar how many calories are ther in a half dozen small candy bars?

Determine if the solution set for the system of equations shown is the empty set, contains one point or is infinite. x + y = 5 x + y = 7 {} 1 solution infinite