Which of the following equations is NOT equivalent to ~$4x^{2}=y^{2}-9$~ ?

A certain company sold 800 units of its product for $8 each and 1,000 units of its product for $5 each. If the company's cost of producing each unit of its product was $6, what was the company's profit or loss on the 1,800 units of its product?

If 0 < r < 1< s < 2, which of the following must be less than 1?

I. ~$\frac{r}{s}$~

II. ~$rs$~

III. ~$s-r$~

A retailer sold anappliance for $80. If the retailer'sgross profit on the appliance was 25 percent of the retailer's cost for theappliance, how many dollars was the retailer's gross profit?

Each year Mark works40 hours per week for 50 weeks. Last year Mark was paid a total of$20,000. If this year his hourly payrate is raised by $0.50, what is the total amount that Mark will be paid thisyear?

A certain kennel will house 24 dogs for 7 days. Each dog requires 10 ounces of dog food per day. If the kennel purchases dog food in cases of 30 cans each and if each can holds 8 ounces of dog food, how many cases will the kennel need to feed all of the dogs for 7 days?

A certain company charges $6 per package to ship packages weighing less than 2 pounds each. For a package weighing 2 pounds or more, the company charges an initial fee of $6 plus $2 per pound. If the company charged $38 to ship a certain package, which of the following was the weight of the package, in pounds?

Three boxes ofsupplies have an average (arithmetic mean) weight of 7 kilograms and a medianweight of 9 kilograms. What is themaximum possible weight, in kilograms, of the lightest box?

List K consists of 12consecutive integers. If -4 is the least integer in list K, what is the range of the positive integers in list K ?

If two sides of a triangle have lengths 2 and 5, which of the following could be the perimeter of the triangle ?

I. 9

II. 15

III. 19