exam Maths Puzzle Numerical Ability

n(n2-1n)+n(n-1) trying to help my daughter, no idea how to solve this. the 2 is n squared.
thanks for your help

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exam Other Question

Please help. My worksheet asks the following question.

Refer to this division problem:

x-6 divided by x+4 divided by x+7 divided by x+5

x+6/x+4 divided by x+7/x+5

Not e Reena and Ria working together can complete a job in 1 1/2 hours. If Reena works alone for 1 hour and is then joined by Ria, the two together can finish the remaining job in 3/4 hour. How long will it take each person working alone to complete the job?