Function Values and Interpretation

Oct 13, 2025 by wbrum.org 13 views

A Wholesaler's Guide to Pricing Lemonade: Understanding the Function and Domain

As a wholesaler, determining the cost of buying a certain quantity of lemonade is crucial for making informed business decisions. The function $f(x) = 8 \sqrt{x}$ is used to calculate the cost, in dollars, to buy $x$ gallons of lemonade. In this article, we will explore the given function values, interpret their meaning, and determine an appropriate domain for the function.

Function Values and Interpretation

To understand the function values, we need to substitute different values of $x$ into the function $f(x) = 8 \sqrt{x}$ . Let's start with some simple values:

When x = 1: $f(1) = 8 \sqrt{1} = 8$ dollars. This means that buying 1 gallon of lemonade costs $8.
When x = 4: $f(4) = 8 \sqrt{4} = 8 \cdot 2 = 16$ dollars. This means that buying 4 gallons of lemonade costs $16.
When x = 9: $f(9) = 8 \sqrt{9} = 8 \cdot 3 = 24$ dollars. This means that buying 9 gallons of lemonade costs $24.

As we can see, the function values are increasing as the value of $x$ increases. This makes sense, as buying more gallons of lemonade would cost more.

Domain of the Function

The domain of a function is the set of all possible input values for which the function is defined. In this case, the function $f(x) = 8 \sqrt{x}$ is defined for all non-negative real numbers, as the square root of a negative number is not a real number.

However, since the function is used to calculate the cost of buying lemonade, we need to consider the practical limitations of the problem. We cannot buy a negative number of gallons of lemonade, so the domain of the function should be restricted to non-negative real numbers.

Restricting the Domain

To restrict the domain of the function, we can use the following inequality:

x \geq 0

This inequality states that the value of $x$ must be greater than or equal to 0. This is because we cannot buy a negative number of gallons of lemonade.

In conclusion, the function $f(x) = 8 \sqrt{x}$ is used to calculate the cost of buying $x$ gallons of lemonade. We have explored the function values and interpreted their meaning, and determined an appropriate domain for the function. The domain of the function is restricted to non-negative real numbers, as we cannot buy a negative number of gallons of lemonade.

As a wholesaler, it is essential to understand the function and domain of the function to make informed business decisions. By using the function $f(x) = 8 \sqrt{x}$ , we can calculate the cost of buying a certain quantity of lemonade and make decisions based on that information.

Cost per Gallon: The function $f(x) = 8 \sqrt{x}$ calculates the total cost of buying $x$ gallons of lemonade. To find the cost per gallon, we can divide the total cost by the number of gallons.
Optimizing the Function: To optimize the function, we can use techniques such as calculus to find the minimum or maximum value of the function.
Real-World Applications: The function $f(x) = 8 \sqrt{x}$ has real-world applications in various industries, such as agriculture, manufacturing, and logistics.

[1] "Mathematics for Business and Economics" by John C. Nelson
[2] "Calculus for Business and Economics" by John C. Nelson
[3] "Mathematics for the Real World" by Michael Sullivan

Domain: The set of all possible input values for which the function is defined.
Function: A relation between a set of inputs (called the domain) and a set of possible outputs (called the range).
Square Root: A mathematical operation that finds the number that, when multiplied by itself, gives a specified value.

Proof of the Function: The function $f(x) = 8 \sqrt{x}$ $f (x) = 8 x$ can be proven using the following steps:
1. Start with the function $f(x) = 8 \sqrt{x}$ .
2. Square both sides of the equation to get $f(x)^2 = 64x$ .
3. Take the square root of both sides of the equation to get $f(x) = 8 \sqrt{x}$ .
4. Therefore, the function $f(x) = 8 \sqrt{x}$ is a valid function.
  A Wholesaler's Guide to Pricing Lemonade: Understanding the Function and Domain

Q: What is the function $f(x) = 8 \sqrt{x}$ used for?

A: The function $f(x) = 8 \sqrt{x}$ is used to calculate the cost, in dollars, to buy $x$ gallons of lemonade.

Q: What is the domain of the function?

A: The domain of the function is restricted to non-negative real numbers, as we cannot buy a negative number of gallons of lemonade.

Q: How do I calculate the cost of buying a certain quantity of lemonade?

A: To calculate the cost of buying a certain quantity of lemonade, simply substitute the value of $x$ into the function $f(x) = 8 \sqrt{x}$ .

Q: What is the cost per gallon of lemonade?

A: To find the cost per gallon of lemonade, divide the total cost by the number of gallons.

Q: Can I use the function $f(x) = 8 \sqrt{x}$ to calculate the cost of buying a negative number of gallons of lemonade?

A: No, the function $f(x) = 8 \sqrt{x}$ is only defined for non-negative real numbers, so you cannot use it to calculate the cost of buying a negative number of gallons of lemonade.

Q: What are some real-world applications of the function $f(x) = 8 \sqrt{x}$ ?

A: The function $f(x) = 8 \sqrt{x}$ has real-world applications in various industries, such as agriculture, manufacturing, and logistics.

Q: How can I optimize the function $f(x) = 8 \sqrt{x}$ ?

A: To optimize the function, you can use techniques such as calculus to find the minimum or maximum value of the function.

Q: What is the range of the function $f(x) = 8 \sqrt{x}$ ?

A: The range of the function $f(x) = 8 \sqrt{x}$ is all non-negative real numbers, as the function is only defined for non-negative real numbers.

Q: Can I use the function $f(x) = 8 \sqrt{x}$ to calculate the cost of buying a fractional number of gallons of lemonade?

A: Yes, you can use the function $f(x) = 8 \sqrt{x}$ to calculate the cost of buying a fractional number of gallons of lemonade, as the function is defined for all non-negative real numbers.

Q: What is the square root of a negative number?

A: The square root of a negative number is not a real number, as the square of any real number is always non-negative.

Q: Can I use the function $f(x) = 8 \sqrt{x}$ to calculate the cost of buying a large quantity of lemonade?

A: Yes, you can use the function $f(x) = 8 \sqrt{x}$ to calculate the cost of buying a large quantity of lemonade, as the function is defined for all non-negative real numbers.

Q: How can I use the function $f(x) = 8 \sqrt{x}$ in a real-world scenario?

A: You can use the function $f(x) = 8 \sqrt{x}$ to calculate the cost of buying a certain quantity of lemonade, and then use that information to make informed business decisions.

Q: What are some common mistakes to avoid when using the function $f(x) = 8 \sqrt{x}$ ?

A: Some common mistakes to avoid when using the function $f(x) = 8 \sqrt{x}$ include:

Using the function to calculate the cost of buying a negative number of gallons of lemonade.
Using the function to calculate the cost of buying a fractional number of gallons of lemonade without considering the practical limitations of the problem.
Not considering the domain of the function when using it to calculate the cost of buying a certain quantity of lemonade.

Q: How can I verify the accuracy of the function $f(x) = 8 \sqrt{x}$ ?

A: You can verify the accuracy of the function $f(x) = 8 \sqrt{x}$ by using it to calculate the cost of buying a certain quantity of lemonade and then checking the result against the actual cost of buying that quantity of lemonade.

Q: What are some alternative functions that can be used to calculate the cost of buying a certain quantity of lemonade?

A: Some alternative functions that can be used to calculate the cost of buying a certain quantity of lemonade include:

$f(x) = 8x$
$f(x) = 8x^2$
$f(x) = 8 \log(x)$

Note that these functions may have different domains and ranges than the function $f(x) = 8 \sqrt{x}$ , so be sure to consider the practical limitations of the problem when using them.