Suppose an investor purchased x ounces of gold in January 2006 at the prevailing price of $549.86 per ounce and then sold this amount of gold in January 2010 for $1112.30 per ounce. (a) Find an equation to express the realized gain, y, in terms of x.  (b) Find the point of intersection of the graph of this equation with the graph y= 10,000 to determine the number of ounces of gold that would result in a gain of $10,000

A statistical program is recommended. A certain company produces and sells frozen pizzas to public schools throughout the eastern United States. Using a very aggressive marketing strategy, they have been able to increase their annual revenue by approximately $10 million over the past 10 years. But increased competition has slowed their growth rate in the past few years. The annual revenue, in millions of dollars, for the previous 10 years is shown. Year 1 2 3 4 5 6 7 8 9 10 Revenue 8.53 10.84 12.98 14.11 16.31 17.11 18.27 18.55 18.40 18.43

With aging, body fat increases and muscle mass declines. The graph to the right shows the percent body fat in a group of adult women and men as they age from 25 to 75 years. Age is represented along the x-axis, and percent body fat is represented along the y-axis. For what age does the percent body fat in men reach a maximum? What is the percent body fat for that age? The percent body fat in men reaches a maximum at the age of years. What is the percent body fat at the maximum? % Percent Body Fat Percent Body Fat in Adults 40- 30- 20- 25 Momen 50 Age Men 75 Q Q

The cost of driving a car includes both fixed costs and mileage costs. Assume that it costs $178.40 per month for insurance and car payments and $0.26 per mile for gasoline, oil, and routine maintenance. (a) Find values for m and b so that y = mx + b models the monthly cost of driving the car x miles. (b) What does the value of b represent?