How do you write a variable expression for the word phrase "the sum of 9 and a number"?

Answer 1

In math, any number you don't know - and/or want to find can be named after whatever you want, but there are some conventions.

The most common letter used is #x#, but you won't find it strange when the variable comes as #y#, #a#, #b#, #t#... And it makes no difference!

If #x+1=2# and #y+1=2#, what's the difference? None!

In this case, you can rename it as #9+x#, using the most commonly used letter in the alphabet!

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Answer 2

Avery Alexander

The variable expression for the phrase "the sum of 9 and a number" is ( 9 + x ), where ( x ) represents the unknown number.

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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.