exam Maths Puzzle Numerical Ability

Help im having a hrad time with these problems. Please break them down so i can learn the steps to solving them. Thank you



1. Simplify and evaluate:
(x7y-4z0/5-2x3y-8z-

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exam Other Question

How do I graph the following rational function:
f(x)= 1/x^2+4

Thank you for your help.
y=-2/5 x-18
2x-3y=22