How do you define a variable and write an expression for each phrase: the sum of eighteen and b?

Answer 1

#18 + b#

You will need to define a variable when a question refers to "the number of people on a bus", or "the price of a packet of apples", or "a certain number."

In this case the variable is clearly #b#.

The main operation is addition - indicated by the the word "sum".

So what is being added? 18 and the variable #b#.

An expression is merely a statement, while an equation has an equal sign and not asked for on this case. The expression is #18 + b#

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Answer 2

Abigail Allen

To define a variable and write an expression for the phrase "the sum of eighteen and b," you would first assign a variable to represent the unknown value, typically denoted by a letter. Let's use the variable ( x ) to represent the sum. Then, you would write an expression to represent the sum of eighteen and ( b ). The expression would be ( x = 18 + b ).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.