exam Maths Puzzle Numerical Ability

2, 5, 8, 11. whats the sum of first 50 terms.

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Please help...my original problem is: 2(x-5)^2 = 3.

I think the answer is: x= 10 (plus/minus) sq.rt.6 / 2....am I on the right track?

Thank you for your help! hi...
my teacher is teaching us about the lab gear blocks.the 1,2,5,x,y,xy,x2,y2,5x,5y blocks
we have to find a way using one xy block and two y blocks, build and then sketch an