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18 x 24 = (18 x 20) + (18 x 4)
18/x
A number x added to 18 would be written x + 18. The value* of x + 18 would depend on the value x. For example, if x was 2, x + 18 would equal 20. if x was 10, x + 18 would equal 28, and so on. *'Value' means what actual number it comes to.
x-18=5 times -5 x-18=-25 x=-25+18 x=-7
18" = 1.5 feet 18" x 18" = 1.5-ft x 1.5-ft = 2.25 square feet