In an experimental setting, the pressure and the temperature of gas in a container are directly proportional. In the first experiment, the pressure of the gas was and the temperature of the gas was , where is a constant value not equal to . If a second experiment found a temperature of , which of the following represents the pressure of the gas?

An instrument reads two values, and daily. The values directly vary with respect to each other. If on Monday the value of was and was , which of the following could be the values for and on Wednesday?

In a given solution, the proportion of water to apple juice is directly proportional. If the first batch of the solution contained gallons of apple juice and gallons of water, how many gallons of apple juice will be needed for a solution containing gallons of apple juice?

The length, in inches, of a box is . Which of the following gives the length, inches, in terms of the width, inches, of the box?

The diameter of a specific brand of candy wrapper is longer than half the volume of the candy itself. Find the expression for the diameter, , in terms of the volume, .

The price of silver varies directly as the square of the mass. If 3.6 g of silver is worth $64.80, what is the value of 7.5 g of silver?