First you add 4 and 3 then you get 7 so you write the problem like this
3n + 7 and that is your answer
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When n = 4, 3n = 3*4 = 12
3n x 3n = 9n if 9n = 36 then n = 36/9 = 4
To find the answer to 3n + 15 for n = 4, you substitute 4 in place of n in the expression. So, 3(4) + 15 = 12 + 15 = 27. Therefore, the answer to 3n + 15 for n = 4 is 27.
3n+2+3n+2=6n+4
In 3n-1 equals 11, n is 4.3n - 1 = 113n - 1 + 1 = 11 + 13n = 123n/3 = 12/3n = 4