In mathematics, the expression 9n represents the product of 9 and n. This means you are multiplying the number 9 by the variable n. The result will vary depending on the value of n. For example, if n equals 2, then 9n would equal 18 (9 multiplied by 2).
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9*(n+5) = 9n +9*5 = 9n + 45
4n - 5n is biger and no it not
The equation "9n equals 126" can be written as 9n = 126.
9n + 18 = 81 9n = 63 n = 7
9n+9=81 9n=72 n=8