Simple,
You have 11 [tex] \frac{5}{8} [/tex]
to change it into an improper fraction multiply the whole number (11) by the denominator (8)
11*8=88
Then, add the numerator to what you have multiplied..
88+5=93
Finally, use the original denominator....
Making your answer...
[tex] \frac{93}{8} [/tex]
Thus, your answer.