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slamgirl [31]
3 years ago
13

The average of 5 numbers is 20. what is the sum of these same numbers?

Mathematics
1 answer:
Vinil7 [7]3 years ago
4 0
Average = (A₁+A₂+A₃+A₄+A₅)/5. Since average = 20 (GIVEN), then:

20 = (A₁+A₂+A₃+A₄+A₅)/5

Or (A₁+A₂+A₃+A₄+A₅) = 20x5

(A₁+A₂+A₃+A₄+A₅) = 100

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NemiM [27]

Answer:

2,047

Step-by-step explanation:

Given:

1+2+4+8+...

Find:

S_{11}

You are given the geometric sequence. From the given sum, you can see that

b_1=1\\ \\b_2=2=1\cdot 2=b_1\cdot 2\\ \\b_3=4=2\cdot 2=b_2\cdot 2\\ \\b_4=8=4\cdot 2=b_3\cdot 2\\ \\....\\ \\r=2

To find the sum S_{11}, use formula

S_n=\dfrac{b_1(1-r^n)}{1-r}

Hence,

S_{11}=\dfrac{1\cdot (1-2^{11})}{1-2}=\dfrac{1-2,048}{-1}=2,047

5 0
3 years ago
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SashulF [63]

Answer:

Option B

Step-by-step explanation:

Let the point O is the origin.

Then the coordinates of the vertices A,B and C will be,

A → (-12, -8)

B → (-8, 0)

C → (-6, -4)

Rule for the dilation of a point (x, y) by scale factor 'k' about the origin is,

(x, y) → (kx, ky)

By this rule, coordinates of the vertices of the image triangle will be,

If k = \frac{1}{2},

A(-12, -8) → A'(-6, -4)  

B(-8, 0) → B'(-4, 0)

C(-6, -4) → C'(-3, -2)

From the given options,

Option B is the answer.

8 0
2 years ago
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3 years ago
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Romashka-Z-Leto [24]
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4 0
3 years ago
Read 2 more answers
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Mila [183]

Answer:

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  6. First Quartile = 5

Step-by-step explanation:

7 0
2 years ago
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