Prove a ≡ b (mod n) and b ≡ a (mod n) if and only if a= - b or b​

You are assembling pieces of an iron gate to complete a fence. the finished gate will look like the one below. in order to assemble the gate it is important to under how the pieces are related. part 1: how are pies 1 and 2 in the archway related? part 2: how are the rectangular sections 5 and 6 in the center of the gate related to each other?

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10