Which table represents a linear function?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.