What is #-42+ 57- 14+ 80#?

Answer 1

#81#

This can be thought of as moving up and down the number line, or as adding integers.

Positive # rarr # move to the RIGHT Negative #rarr# move to the LEFT
#-42+57-14+80#

I would rather reorder the numbers so that the positives appear first.

=#color(blue)(+57+80)color(red)(-42-14) " "larr# simplify separately first
=#color(blue)(137)color(red)(-56) " "larr# there are more positives.
=#81#
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Answer 2

-42 + 57 - 14 + 80 = 81.

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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.

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.

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.

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.

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