a)
[tex]d = 12 - 7 \\ d = 5[/tex]
b)
[tex]p = 9 \frac{3}{4} - 5 \frac{1}{2} \\ p = 9 \frac{3}{4} - 5 \frac{2}{4} \\ p = 4 \frac{1}{4} [/tex]
c)
[tex]m = 8 \frac{1}{3} - 4 - 2 \frac{3}{4} \\ m = 4 \frac{1}{3} - 2 \frac{3}{4} \\ m = 4 \frac{4}{12} - 2 \frac{9}{12} \\ m = 3 \frac{16}{12} - 2 \frac{9}{12} \\ m = 1 \frac{7}{12} [/tex]
d)
[tex]c = 15 - 8 \frac{1}{2} - 3 \frac{3}{4} \\ c =15 - 8.5 - 3.75 \\ c = 6.5 - 3.75 \\ c = 2.75 \\ c= 2 \frac{3}{4} [/tex]
