book Maths Puzzle Numerical Ability

determine the sum for the geometric sequence:
n=12 , r=3 , T1 = 1/9

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book Other Question

can you show me your method of doing this

-4x-12y-11z=-53
3x-5y-8z=-9
-9x-10y+7z=-24 Bob sold hammers and wrenches at a flea market. He sold 4 times as many hammers as wrenches. The total sales equaled $609.00. If the hammers sold for $3.00 apiece and the wrenches for $2.50 each how many hammers and wrenches did he sell?