Find the sum of the following number sequence: #2+4+6+8+10#?

Answer 1

30

We'll solve this bit by bit: #2+4+6+8+10=6+6+8+10# #=12+8+10# #=20+10# #=30#
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Answer 2

Sequences like this, where the numbers are spaced equally, have a quick way to sum up.

Add the first and the last term and divide by #2# to get the mean. Then multiply by the number of terms.
#(2+10)/2xx5=12/2xx5=6xx5=30#
For long sequences this is much faster than just adding. E.g. adding all numbers from #1->100# inclusive:
#(1+100)/2xx100=101/cancel2xx(cancel2xx50)=5050#
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Answer 3

The sum of the number sequence 2+4+6+8+10 is 30.

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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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