Given a set # {-1, x ,-4, -21} #, for what x would the mean of the set be 0?

Answer 1

#x=26#

It is assumed that by Mean we mean Arithmetic Mean. This is just a sum of all numbers divided by 'number' of numbers. As there are four numbers here,for mean to be #0#, sum of four numbers needs to be #0# too.
As sum of three known numbers is -26, #x# must be equal to #26# for mean to be #0#.
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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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