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erica [24]
3 years ago
6

Which number line correctly shows 1.1, 8/5 , and 1 2/5 ?

Mathematics
2 answers:
Cerrena [4.2K]3 years ago
3 0
Answer=B and second graph

cricket20 [7]3 years ago
3 0
Attachment #2.
1.1 = the first dot
8/5 - 1 3/5. 
The graphs are showing out of 10 but the denominators are out of 5. So multiply the top like you did with the bottom to get:
1 3/5 - 1 6/10. 1 2/5 - 1 4/10.
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For  example,

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1,     3,     6,      10

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                          *              *  *

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* ,    *  *,     *   *   *,     *   *   *  *

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The pentagonal numbers

The sequence:

1, 5, 12, 22, 35

As shown in the picture can be divided into three triangles

Triangle 2

x (x + 1) / 2

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n (n + 1) / 2

n= x-1

Replacing n

(x-1) ((x-1) + 1) / 2

(x-1) (x) / 2

(x-1) x / 2

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Triangle 1  = Triangle 3

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Triangle 2 + 2* Triangle 1

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Rearranging

0.5 x (x +1) + x(x -1)

0.5x^2 + 0.5x + x^2 -x

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