What Do You Know About Substitution & Evaluating Expressions?

Explanation
Substitution is a topic under algebra. In algebra, substitution refers to the process of replacing variables with specific values in an equation or expression. This technique is commonly used to solve equations, simplify expressions, or evaluate functions. By substituting specific values for variables, algebraic problems can be simplified and solved more easily.

Explanation
Algebra is a branch of mathematics that deals with symbols and the rules for manipulating those symbols to solve equations and analyze mathematical relationships. It is a fundamental topic in mathematics and is taught as a separate course or as a part of the mathematics curriculum in schools and universities. Algebra is used extensively in various fields such as physics, engineering, computer science, and economics, making it an essential subject in the study of mathematics.

Explanation
Mathematics is taught in schools as it is an essential subject in the curriculum. Schools provide a structured environment for students to learn and practice mathematical concepts and skills. Teachers in schools are trained to teach mathematics effectively and provide guidance to students. Additionally, schools have resources such as textbooks, classrooms, and educational materials that support the teaching and learning of mathematics.

Explanation
Barack Obama is not a scientist because he is a politician and the 44th President of the United States. While Bill Nye, Isaac Newton, and Albert Einstein are all well-known scientists in their respective fields.

Explanation
Substitutions means replacing the letters in an equation or expression with specific numbers. In mathematics, when solving equations or evaluating expressions, we often use substitutions to simplify the problem by assigning values to the variables. By substituting numbers for letters, we can then perform calculations and find the solution. Therefore, "substitutions" is the correct answer as it accurately describes the process of putting numbers where the letters are in mathematical equations or expressions.

Explanation
When we substitute a specific value for each variable in an expression and then perform the operations, it is called evaluating expressions. This process allows us to determine the value of the expression for the given values of the variables. It is a fundamental concept in mathematics and is used in various applications such as solving equations, simplifying expressions, and finding the value of a function at a specific point.

Explanation
Evaluating expressions involves performing mathematical operations on given values or variables to obtain a numerical result. This process is a fundamental concept in mathematics, as it allows for the simplification and calculation of mathematical equations. Therefore, the correct answer is Mathematics.

Explanation
In Algebra, we don't use blank boxes to represent unknown values or variables. Instead, we use letters to represent these variables. This allows us to generalize equations and solve for unknown quantities in a more flexible and efficient manner. By using letters, we can easily manipulate and solve equations involving multiple variables, making Algebra a powerful tool in mathematics.