\(d = 4n -2 \\d + 2 = 4n\\\frac{1}{4}d + \frac{2}{4} = n\\\
= 0.25d + 0.5\)
For a 3-penny nail
\(n = 0.25d + 0.5\\ n = 0.25(3) + 0.5\
= 0.75 +0.5\\\
= 1.25\)
For a 6-penny nail
\(n = 0.25d + 0.5\
= 0.25(6) + 0.5\
= 1.5 + 0.5\\\
= 2\)
For a 10-penny nail
\(n = 0.25d + 0.5\
= 0.25(10) + 0.5\
= 2.5 + 0.5\\\
= 3\)
Hope that helped :)
