exam Maths Puzzle Numerical Ability

make an input-output table for the functions. useing 0,1,2,and 3
y=21-2x

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exam Other Question

The problem states to rationalize the denominator.

The sqrt of 2 - 4/z^2 + 2/z^4

I came up with (z^2 - 1) * sqrt of 2 over z^2

Any help would be greatly appreciated. Thanks! Use the geometric sequence of numbers 1, 1/2, 1/4, 1/8,�to find the following:
a) What is r, the ratio between 2 consecutive terms?

Show work in this space.

b) Using