book Maths Puzzle Numerical Ability

Please healp me I need a graph of these three problems. Please help me Thanks!!

b)
x -2 -1 0 1 2
y .25 .5 1 2 4

Given the table above, graph the function, identify the grap

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book Other Question

I'm not sure how to get the square root of 1/5
Could you help me? thanks!
Why do you think variables are useful in algebra