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Daniel [21]
3 years ago
10

Find S25 for -7+ -2 + 3 + 8 +…

Mathematics
1 answer:
vovangra [49]3 years ago
5 0
We know S(n) = n/2 [ 2a + (n-1)d ]
Here, n = 25
a = -7
d = -2-(-7) = -2+7 = 5

Substitute their values, 
S(25) = 25/2 [2(-7) + (25-1)5 ]
S(25) = 25/2 [-14 + 120 ]
S(25) = 25/2 [106 ]
S(25) = 25 [ 53 ]
S(25) = 1325

In short, Your Answer would be 1325

Hope this helps!
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Step-by-step explanation:

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3 years ago
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The intermediate step are;

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Step-by-step explanation:

The function given in the question is 6·x² + 48·x + 207 = 15

The intermediate steps in the to express the given function in the form (x + a)² = b are found as follows;

6·x² + 48·x + 207 = 15

We get

1) Subtract 207 from both sides gives 6·x² + 48·x = 15 - 207 = -192

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3) Add the constant that completes the square to both sides

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4) Factorize (x + 4)² = -16

5) Compare (x + 4)² = -16 which is in the form (x + a)² = b

7 0
3 years ago
A square serving platter has an area of 124 inches squared. Which is the best estimate of the side length of the platter?
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Step-by-step explanation:

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3 years ago
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Step-by-step explanation:

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3 0
3 years ago
Is 1/6 greater than 1/3
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No, 1/3 is greater than 1/6. 
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2/6 > 1/6
4 0
3 years ago
Read 2 more answers
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