book Maths Puzzle Numerical Ability

In the card game Bridge, a yarborough is a 13-card hand containing only cards numbered 2 through 9. Find the number of ways in which to get a yarborough.

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book Other Question

how do you change 3 5/8 into a improper fraction? Stuck on homework thanks I am having problems completing the square x^2-8x=10. Below is the steps that I have taken:

x^2-8x+16=10+16
x^2-8x =26
(x-4)^2=26

This is where I am completely lost.