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Q: Write the phrase as a variable expression. Use x to represent "a number."The sum of a number and 138?

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the def for variable is a letter or symbol used to represent a missing number in an algebrac expression

16x

X+6. Variable (x)

it is the number you would use to solve the problem

The number is called the coefficient of the variable

That looks like the description of an EXPRESSION. However, an expression need not have "at least one operation"; a single number, or variable, is a perfectly valid expression.

A variable is a letter that represents a number. An expression that contains at least one variable is called variable expression, also called algebraic expression. A variable expression has one or more terms. A term is a number, a variable, or a product of numbers and variables. For example,3(x^2)y + 2xy + x - 7 is a variable expression, where you have 4 terms.When working with variable expression, you often use the substitution principle:If a = b, then a may be replaced by b in any expression.The set of numbers that a variable may be represent is called replacement set, or domain, of the variable. To evaluate a variable expression, you replace each variable with one of its values and simplify the numerical expression that results.Example: Evaluate the expression 2x - 4y for x = 5 and y = -9.Solution:2x - 4y= 2(5) - 4(-9)= 10 + 36=46

It is the coefficient of the variable

any number at all

The term for replacing a variable with another value or expression is "substitution."

It is a poorly worded question. Any number in an expression can be a numerical variable.

A variable expression has at least one variable in it (which is usually a letter that stands for an unknown number).

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