I need help with this math

Answer:
[tex]PQ=6\frac{1}{2} =\frac{13}{2}[/tex]
[tex]|Q-P|=\frac{13}{2}[/tex]
[tex]|Q+4|=\frac{13}{2}[/tex]
[tex]Q+4=+-\frac{13}{2}[/tex]
[tex]Q=-4[/tex] ± [tex]\frac{13}{2}[/tex]
[tex]Q=\frac{21}{2} \times2\frac{1}{2}[/tex]
[tex]Answer: C)~2\frac{1}{2}[/tex]
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Each shirt = $12.25
so, x = shirts = 12.25 x
cost including shipping= 77.49
So,
12.25 x + 3.99=77.49
Answer: D)
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hope it helps...
have a great day!!