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What is to substitute for a variable and perform the given operations?
that means to replace the variable with it's value, and then do all the mathematical symbols as normal (+-x/)
What is an algebraic expression by replacing each variable with a given number and performing all operations?
It is called evaluating the equation.
What is a difficult order of operations problem?
Many expressions involve two or more operations. When simplifying such expressions, it is important to perform the operations in the following order:1. Perform any operation(s) within group symbols, which are:a. parentheses ( )b. brackets [ ]c. braces { }d. fraction bar /e. absolute-values bar | |f. radical sign2. Simplify all powers.3. Multiply and divide in order from left to right.4. Add and subtract in order from left to right.If you don't follow this order of operations, you will find a wrong answer.
What can undo operations?
Inverse functions? (not sure what you mean)
What is the definition of four fundamental operations?
The Four Fundamental Operations (Addition, Multiplication, Subtraction and Division) form the basis of the whole study of mathematics and numerical science. These operations form all the other operations that we use in the above specified subjects. So they are called Fundamental Operations Because the can't be derived either in the terms of themselves or any other operator.
