Jack jack broke apart 5 x 216 as 5 x 200 5 x 16 to move to multiply mentally. what strategy did jackie use?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

The tile along the edge of a triangular community pool needs to be replaced? ?

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.