math help

please explain your answer and how you got it..

Samantha had a board that was 6ft. 8in.long.she cut off a piece that was 2 ft.10in.long.how much board does she have left?

A.4ft. 10in
B.4ft. 2in
C.3ft. 2in
D.3ft.10in

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  1. I'll be glad to check your answer.

  2. Convert everything into inches:

    6 ft., 8in.- 80 in.
    2 ft., 10 in.- 34 in.

    80 - 34 = 46 inches.

    46 / 12 = this is 3 feet, 10 inches.

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