If he knows that he is doubling his recipe then first he needs to know how many tablespoons of breadcrumbs he needs. 3 * 2 = 6 tablespoons. Because he is using half tablespoons he needs to multiply that by 2 again. 6 * 2 = 12.
Stop if u not going to ask a real question dont
It is a function because each x value only has one y value. None of the x values are repeating.
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You don't ave enough information I can't answer that question