exam Maths Puzzle Numerical Ability

Please show me how to solve this problem:

2t + 4s = 10
3t + 3d = 9
1t + 3d + 2s = 8

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exam Other Question

I am having trouble with a square root question. The question is: The square root of 108 plus square root of 54 minus the cube root of 729. "plot all the complex numbers in the complex plane whose absolute value is 4. "