exam Maths Puzzle Numerical Ability

can i have help with this please (1/3n-m)(1/3n+m)
thanks

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exam Other Question
In the equation D=44t represents the distance in miles covered, after traveling 44 mph for t hours. Make a graph that shows distance traveled every 30 minutes for zero to 4 hours Simplify
3 divided x-5 plus 1
OVER
1 - 4 divided by x-5

Any help would be great!
Thanks