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Why do you think variables are useful in algebra

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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 I would like help with problem #48 in my text book. I'm not really sure how to type or symbolize a radical sign on this, so "sqrt" will be the same as a radical sign. This is the