exam Maths Puzzle Numerical Ability

I need to factor completly

x^8-1
and
y^3+125

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exam Other Question

I am anew student at this mean mode and median I wish you would show me how to find a missing number I got this problem n,8,18,18,3,6,3 mean=9 How do I find n?
also this one find n 5,17,5,n,5,4 range=14 mean==
can you help me in solving the problem...

ariana took 2 h longer to drive 360 mi on the first day of a trip than she took to drive 270 mi on the second day. if her speed was the same on both days, what was the driving time each day?