The sum of three consecutive numbers is 318. What is the third number in the series?

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

What expression is equivalent to (84+16)