Answer:
[tex]4\frac{3}{4}ft[/tex]
Step-by-step explanation:
Given that Malcolm started with [tex]5\frac{3}{4}ft[/tex] of board, then cut off a section that was 1 foot in length, you can subtract the length of the section from the total amount he started with:
[tex]5\frac{3}{4}ft[/tex] - 1 = [tex]4\frac{3}{4}ft[/tex]