book Maths Puzzle Numerical Ability

solve the following system of linear equations:

3x-2y+4z=1

x+y+2Z=3

2x-3y+6z=8

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book Other Question

Use the Intermediate Value Theorem to show that the graph of the function has a zero in the given interval. Round the zero to two decimal places.
f(x) = 2x3 + x2 - x - 5; [1, 2] Please help square root of 16xy squared/27z to the 5th power.