How does 2+2=4 and 2x2=4 but 3x3=9 and 3+3=6

Classify the polygon by its number of sides. state whether the polygon appears to be regular or not regular. a.heptagon, regular b. heptagon, not regular c. octagon, regular d. octagon, not regular

Combine like terms to make a simpler expression 3z+z

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2