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lana [24]
3 years ago
10

QUICK!URGENT HELP PLEASE!20 POINTS​

Mathematics
1 answer:
tino4ka555 [31]3 years ago
4 0

Answer:

840

Step-by-step explanation:

The 3 by 3 grid below shows nine 1 cm x 1 cm squares and uses 24cm of wire

24 cm of wire

is  3 (3 + 1)  + 3(3 + 1)

= 3 x 4 + 3 x 4

=  12 + 12

= 24 cm

length of wire is required for a similar 20 by 20 grid

= 20(20 + 1)  + 20(20 + 1)

= 20 x 21 + 20 x 21

= 420  + 420

= 840  cm

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allsm [11]

Here,

n = 11

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S.E. = ?

We know that,

S.E. = σ/\sqrt{n}

S.E. = 3/\sqrt{11}

∴ S.E. = 0.905 Ans.

5 0
3 years ago
If 3y+2 is equal to -2+y then what is y
garik1379 [7]

Answer:

y=-2

Step-by-step explanation:

3y+2=-2+y

subtract the 1y from both sides leaving you with 2y+2=-2

Then subtract 2 from both sides leaving you with 2y=-4

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5 0
3 years ago
lisa goes to school for 7 hours per day works 3 hours per day and sleeps 8 hours per day. what is the ratio of hours lisa works
frozen [14]

Answer:

ratio of hours lisa works to hours lisa sleeps= 3:8

Step-by-step explanation:

lisa goes to school for 7 hours per day lisa works 3 hours per day

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ratio of hours lisa works to hours lisa sleeps= hours Lisa works/hours Lisa sleeps

ratio of hours lisa works to hours lisa sleeps= 3/8

ratio of hours lisa works to hours lisa sleeps= 3:8

4 0
3 years ago
The area of a square notepad is 100 square centimeters how long is each side?
yan [13]

Answer:

10 cm

Step-by-step explanation

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3 0
3 years ago
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OverLord2011 [107]

Answer:

tangent

Step-by-step explanation:

3 0
3 years ago
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