A logistics company uses the formula ${}15d + 200$ to calculate the total cost of a delivery trip, where $d$ represents the number of deliveries and 200 is a fixed daily insurance fee. What is the mathematical term for a number like 200 whose value always stays the same?

A catering company uses the formula ${}18p + 45$ to calculate the total cost for a party, where $p$ is the number of people and 45 is a fixed delivery fee. In mathematics, a number like 45 whose value always stays the same is known as a(n) ____.

An internet service provider charges a flat monthly infrastructure fee of {}5.50 on every customer's bill. True or False: In an algebraic expression representing the total monthly cost, this {}5.50 fee is called a constant because its value remains the same regardless of how much data the customer uses.

Defining Mathematical Constants in Professional Contexts

A landscaping company uses the formula ${}45h + 20$ to calculate the total charge for a service, where $h$ is the number of hours worked and 20 is a fixed equipment fee. Match each mathematical term to the part of the formula it describes.

Billing Standardization at Sparky's Installations

Defining Constants in Professional Billing

Algebraic Constant

Arithmetic Operation Symbols in Algebra

Equality Symbol in Algebra

Arithmetic Operation Symbols

Defining Variables in Corporate Expense Formulas

What does a variable such as $x$ represent in algebra?

In $3x$, what does $x$ represent?

What is the letter $x$ called when it represents a number that may change?

Match each algebra term with its meaning.

In the expression $x+y$, what are the letters $x$ and $y$ called? Define this algebraic term.

In algebra, a letter that represents an unknown or changing number is a _____.

True or false: In algebra, $n$ can be a variable that represents a changing or unknown number.

Put the steps for using a variable to represent an unknown number in order.

In the expression $t+4$, what algebraic term describes $t$? Define the term.