A Rule for Estimating the Number of Board Feet of Lumber

question 97

Multiple Choice

A rule for estimating the number of board feet of lumber that can be cut from a log depends on the diameter of the log. To find the diameter, \mathrm{d} , required to get 7 board feet of lumber, we use the equation $\left( \frac { d - 4 } { 4 } \right) ^ { 2 }$ =49 . Solve this equation for d. Are both answers reasonable?

• A) 32,-24 ; No, only 32 feet is a reasonable answer.
• B) 11,-28 ; No, only 11 feet is a reasonable answer.
• C) 24,-32 ; No, only 24 feet is a reasonable answer.
• D) 28,-28 ; No, only 28 feet is a reasonable answer.

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