Twelve inches is cut from a board. The remaining board is 18 inches long. How long was the board before it was cut? Write only the number.

Total length  = Amount cut off +  amount remaining.

Total length = 12 + 18 = 30 inches

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step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.