exam Maths Puzzle Numerical Ability

John Roberts has $42,180.53 in a brokerage account, and he plans to contribute an additional $5,000 to the accout at the end of every year. The brokerage account has an expected an

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I need to justify each of these step, please help me with this.

5(n+4)+9n= (5n+20)+9n

=5n+(20+9n)
=5n+(9n+20)
=(5n+9n)+20
=(5+9)n+20
=14n+20 i have a wksht ???..can you still help me?
Solve the following system of equations:
4x-y=3
2x+3y=5
i got x=-7/9
y=-29/7
i dont think what i have is right