write an expression that represents the sum 7 and x
The correct answer and explanation is:
Expression:
The expression that represents the sum of 7 and x is: 7+x7 + x
Explanation (300 words):
In mathematics, the term “sum” refers to the result of adding two or more numbers or variables. When a question says “the sum of 7 and x,” it means we need to add the number 7 and the variable x together.
Let’s break this down further:
- 7 is a constant. It is a fixed value.
- x is a variable. It can represent any number and is often used in algebra to stand in for unknown values.
When we say “the sum of 7 and x,” we are combining these two values using addition. The symbol for addition is the plus sign (+). So, when we write 7 + x, we are saying, “take 7 and add x to it.”
This expression does not mean that 7 and x are being multiplied, subtracted, or divided—only added. Even if we don’t know the value of x, this expression is still mathematically valid. It simply shows a relationship or operation between two values.
For example, if x = 3, then the expression becomes: 7+x=7+3=107 + x = 7 + 3 = 10
If x = 0, then: 7+x=7+0=77 + x = 7 + 0 = 7
And if x = -2, then: 7+x=7+(−2)=57 + x = 7 + (-2) = 5
This kind of expression is fundamental in algebra because it teaches students how to work with unknowns and understand how numbers and variables interact. Learning to represent situations using expressions like 7 + x is the first step toward solving equations, analyzing relationships, and modeling real-world problems.
In conclusion, the correct expression for the sum of 7 and x is 7 + x, and it is a simple yet powerful way to represent an addition operation involving a known value and a variable.