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Key Concept Quiz 4.4
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1
Sandy is planning a surprise birthday party, to be held at a restaurant. The restaurant offers room rental for a flat $100, plus $25 per person for dinner. Model the cost C in terms of the number of people expected n.
A)C = 100n + 25
B)C = 25n + 100
C)C = 100n – 25
D)C = 25n – 100
2
Rearrange the formula in question #1 to express n in terms of C.
A)n = 25(C + 100)
B)n = 25(C – 100)
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3
How much will the party cost if 20 people attend?
A)$100
B)$250
C)$500
D)$600
4
How many people can attend if the budget for the party is $1000?
A)40
B)36
C)20
D)10
5
A useful formula in physics is v2u2 = 2ad. If you want to express v in terms of the other variables, the first step is to
A)add u2 to both sides of the equation.
B)subtract u2 from both sides of the equation.
C)multiply both sides of the equation by u2.
D)divide both sides of the equation by u2.







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