Find the lowest common multiple (LCM) of the 90 and 150

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

20.ju inces. which ordered pair is a viable solution if x represents the number of books he orders and y represents the total weight of the books, in ounces? (-3,-18) (-0.5, -3) (0,0) (0.5, 3)