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A scale is the ratio of the contracted or dilated form with respect to the original form (the ratio of the sizes before and after the scaling operation). The scale factor is the magnitude of the scaling contraction or dilation (the shrinking or expanding) used in the scaling operation.
25 students to sit at 5 tables is a ratio.
scaling up
Ratio tables help organize things out,so its practically like a chart.
For question 1 the answer is the small table because you have to divide the number of tables by the number of pizzas. For answer 2 the answer is no becuse he was scaling down and simplfying the ratios to 9 and 5. The rest I do not know so good luck.