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Old Test Answers

# Old Test Answers - This file contains test questions that I...

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This file contains test questions that I have used on previous midterms and final exams, from 2000 to 2006. Before taking the final exam, be sure that you know how to do all of these problems. The answers are in another document that you can download from WebCT. Chapter 1. 1. Write the equation of the line through ( –3, –1 ) that is perpendicular to x = 4y – 8 Give your answer in the form y = m x + b. y = – 4x – 13 2. Write the equation of the line that passes through ( –3, 5 ) and ( –1, 2 ) y = – 1.5x + 0.5 3. For f (x) = 7 – 2x 2 find and simplify ( f ( x + h ) – f ( x ) ) / h The given expression equals –4x – 2h 4. Solve the equation: ( 3x – 1 ) / ( 4x – 9 ) = 5 / 7 The solution of the equation is x = –38 5. A poiuyt costs \$184.80 including 5% sales tax on the pre-tax price. What is the pre- tax price? The pre-tax price is \$176.00 6. A television set cost the wholesaler \$300. What will the wholesaler sell the set for if the wholesaler's markup is 20% of the wholesale selling price? The wholesale selling price is \$375.00 7. The owner of a small construction business needs a new truck. She can buy a diesel truck for \$38,000 and it will cost her \$0.24 per mile to operate. She can buy a gas engine truck for \$35,600 and it will cost her \$0.30 per mile to operate. Find the number of miles she must drive before the costs are equal.

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8. Given f ( x ) = 5x 2 and g ( x ) = x + 1 find (f ◦ g)(x). (f ◦ g)(x) = 5x 2 +10x + 5 9. If g(x) = x 2 – 3x find and simplify: g( x + h ) / h The expression equals ( x 2 + 2xh + h 2 – 3x – 3h) / h 10. If f(x) = 2 – 3x 2 find and simplify: f( x + 2h ) – f( x + h ) The expression equals – 6xh – 9h 2 11. A company charting its profits notices that the relationship between the number of units sold, x, and the profit, P, is linear. If 200 units sold results in \$3100 profit and 250 units sold results in \$6000 profit, write the profit function for this company and predict the profit if 285 units are sold. The profit function in P(x) = 58x – 8500 If 285 units are sold, the profit will be \$8030 12. A botanist has a 20% solution and a 70% solution of insecticide. How much of each must be used to make 4 liters of a 35% solution? She must use 2.8 liters of the 20% solution and 1.2 liters of the 80% solution. 13. A mixture of ten gallons of a 30% acid solution is obtained by mixing a 20% solution and a 50% solution. Write the system of equations to solve this problem and find out how much of the 20% and 50% solutions are needed. One must use 6.67 gallons of the 20% solution and 3.33 gallons of the 50% solution. 14. A certain commodity has the following costs for a period. Fixed costs: \$1500
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Old Test Answers - This file contains test questions that I...

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