## Functions and Change A Modeling

Business

## Quiz 4 :

Functions Given by Words

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Q11 Q11 Q11

If you are driving at a constant speed, the distance you travel is proportional to the time you spend driving.Using D for the distance traveled, in miles, t for the time, in hours, that you drive, and r for the constant of proportionality, express the proportionality relation using a formula.

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Q14 Q14 Q14

Sugar costs $1.55 per pound, and lemons cost $0.47 each.You sell lemonade for $1.35 per glass.Write S for the pounds of sugar used, L for the number of lemons used, G for the number of glasses of lemonade you sell, and P for the profit, in dollars, you make.Express using a formula your profit in terms of pounds of sugar used, number of lemons used, and number of glasses of lemonade sold.

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Q15 Q15 Q15

With no advertising your newspaper has a circulation of 1042 newspapers.For each dollar you spend on advertising, newspaper circulation increases by 16 newspapers.You sell each paper for 37 cents.You pay $488 to print the paper and have it delivered.Give a formula that shows your net income , in dollars, if you spend dollars on advertising.Suggestion: First calculate the number of newspapers you sell.Don't forget to include the dollars you spend on advertising in your expenses.

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Q19 Q19 Q19

The temperature of an oven remains constant at 391 degrees Fahrenheit.A potato is placed in the oven to bake.The difference between the temperature of the oven and that of the potato after t minutes in the oven is given by degrees Fahrenheit.Write a formula that gives the temperature T, in degrees Fahrenheit, of the potato after t minutes in the oven.

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Q25 Q25 Q25

It takes 13 minutes to preheat your oven.Once the oven is preheated, baking time for a roast is 13 minutes per pound.Using w as the weight of the roast, in pounds, and B for oven time (including preheating time), in minutes, give a formula that shows the oven time for a roast that weighs w pounds.

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