book Maths Puzzle Numerical Ability

i really need help......please somebody help me
5n+1 divided by 8 =1/2

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book Other Question

Determine the number of combinations of 9 things taken 7 at a time. Could you please help me solve this question that's been bugging me for ages:
On the same set of axes, graph the following showing all workings:

a. x is less than or equal t