exam Maths Puzzle Numerical Ability

Please help me!

I need to find the 10th term of the geometric sequence.

a9 = 8; r = .5

thanks

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exam Other Question

Find four consecutive even intergers such that the sum of twice the first, five times the second, and foru times the third divided by three times the fourth equals 3. I need help with this question:
5x+12-3x=-2x-13-x