The revenue from a youth league baseball game depends on the price per ticket, \(x\).

Here is a graph that represents the revenue function, \(R\).

Graph of a function, origin O. Horizontal axis, 0 to 40, by 5s, ticket price, dollars. Vertical axis, 0 to 1400, by 200s, revenue, dollars. Parabola opens downward, starting at 0 comma 0, vertex at around 15 comma 1100, ending at 30 comma 0.

Select all the true statements.

A garden designer designed a square decorative pool. The pool is surrounded by a walkway.

On two opposite sides of the pool, the walkway is 8 feet. On the other two opposite sides, the walkway is 10 feet.

Here is a diagram of the design.​​​​​​

The final design for the pool and walkway covers a total area of 1,440 square feet.

1. The side length of the square pool is \(x\). Write an expression that represents:

   1. the total length of the rectangle (including the pool and walkway)
   2. the total width of the rectangle (including the pool and walkway)
   3. the total area of the pool and walkway
2. Write an equation of the form: \(\text{your expression}=1,\!440\). What does a solution to the equation mean in this situation?

Suppose \(m\) and \(c\) each represent the position number of a letter in the alphabet, but \(m\) represents the letters in the original message, and \(c\) represents the letters in a secret code. The equation \(c=m+2\) is used to encode a message.  

1. Write an equation that can be used to decode the secret code into the original message.
2. What does this code say: "OCVJ KU HWP!"?

An American traveler who is heading to Europe is exchanging some US dollars for euros. At the time of his travel, 1 dollar can be exchanged for 0.91 euros.

1. Find the amount of money in euros that the American traveler would get if he exchanged 100 dollars.
2. What if he exchanged 500 dollars?
3. Write an equation that gives the amount of money in euros, \(e\), as a function of the dollar amount being exchanged, \(d\).
4. Upon returning to America, the traveler has 42 euros to exchange back into US dollars. How many dollars would he get if the exchange rate is still the same?
5. Write an equation that gives the amount of money in dollars, \(d\), as a function of the euro amount being exchanged, \(e\).

A random sample of people are asked to give a taste score—either "low" or "high"—to two different types of ice cream. The two types of ice cream have identical formulas, except they differ in the percentage of sugar in the ice cream.

What values could be used to complete the table so that it suggests there is an association between taste score and percentage of sugar? Explain your reasoning.