book Maths Puzzle Numerical Ability

Factor completely

9x^2 + 12xy + 4y^2 + 25

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book Other Question

I have tried to do the problem
"For each arithmetic series, find S of 25"
3+7+11+15
This is the equation i came up with
25[2(3)+(25-1)d/2]
I just cant find the d and when i try my answer comes out incorrect..
thanks.. Sean made a deposit of $106. If his deposit consisted of 42 bills. Some one-dollar bills and the rest five-dollar bills. How many bills of each kind did he have?