exam Maths Puzzle Numerical Ability

how do you simplify (x^(y+1)+z^2)(x^(y-1)-z^2)

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exam Other Question

How can I Find the slope and y-intercept.and show it in a graph
7x - 3y = -3 Can anyone help me with the following problem?
36x^2=1
I cant figure out how to work it. I have tried several different ways and keep coming up short. The ^2 is an exponent

Thank You