A catering company uses a linear function to determine the total cost of parties. The following table shows the costs for dinner parties with varied numbers of guests. What is the cost to cater a dinner party with 90 guests?GuestsTotal Cost30$31560$555

The cost increases by $555 − $315 = $240 when the guest count increases by 60 − 30 = 30, so the cost is $8 per additional guest. The fixed cost is $315 − (30 × $8) = $75. For 90 guests, the total is $75 + (90 × $8) = $795, so the cost is $795.

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