book Maths Puzzle Numerical Ability

a^2+8a+15

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Two questions:
First one:

The people living on Elm Street all decide to buy new hose numbers. So, they line up in a store in the order of their addresses: (which convenienttly
can you help me solve and show me how u solved the question: 6(N+2)-N=24
i have to be able to solve and show all of the agebraic steps of solving this problem
thank you
Ney Ney