Final answer:
To find out how much wood Francine has left, subtract the amount she used (represented in twelfths) from the total length of the wood. Francine has 7/12 feet of wood left.
Step-by-step explanation:
To find out how much wood Francine has left, we need to subtract the amount she has used from the total length of the wood. Francine has a piece of wood that is 55/12 feet long. She uses three and one foot of the wood for a science project. To subtract the amount she used, we need to find a common denominator for the lengths.
Since the total length is expressed in twelfths, we need to represent the amount she used in twelfths as well. Three feet is equivalent to 36 twelfths (since 3 feet is equal to 36 inches and 1 foot is equal to 12 inches), and one foot is equal to 12 twelfths. Now we can subtract the amount she used from the total length: 55/12 - (36/12 + 12/12).
Simplifying the expression, we get: 55/12 - 48/12 = 7/12.
Therefore, Francine has 7/12 feet of wood left. Answer choice (a) 11/12 feet, answer choice (b) 17/12 feet, answer choice (c) 24/12 feet, and answer choice (d) 38/12 feet are incorrect.