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belka [17]
3 years ago
11

If the 10th of the 10 consecutive numbers is 10, what is their sum?

Mathematics
1 answer:
liq [111]3 years ago
7 0
Represent these consecutive numbers (assuming that they are all integers):

x
x+1
x+2
x+3
x+4
x+5
and so on
x+8
x+9 is the tenth number.  x+9 = 10, so x = 9.

Think of it this way:  there are 10 consecutive numbers, and the last one is 10.

Working backwards, we get the sequence 10, 9, ... 3, 2, 1.

The sum of such an arith sequence is equal to the count of the numbers times the average of the first and last terms:

sum here = 10(1+10)/2 = 5(11) = 55          (answer)
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Step-by-step explanation:

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3 years ago
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spayn [35]

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Step-by-step explanation:

To find the length , all we need to find is the distance between each point ,

the formula for calculating distance between two points is given by :

D = \sqrt{(x_{2}-x_{1}) ^{2}+(y_{2}-y_{1}) ^{2}}

Let the points be :

A ( -5,-1)

B(-5,5)

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Calculating the length AC , we have

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D3 = \sqrt{(x_{2}-x_{1}) ^{2}+(y_{2}-y_{1}) ^{2}}

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3 0
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Step-by-step explanation:

4 0
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Now multiply it.
<span>0.75 x 60% = 45
</span>
45 is the answer. 
3 0
3 years ago
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