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ki77a [65]
2 years ago
9

Lena is building a fence around her rectangular flower garden. The width is twice the length. The perimeter of the garden is 30

ft. What are the length and width of the garden?
Mathematics
2 answers:
Anna35 [415]2 years ago
6 0

Answer:

  • length: 5 ft
  • width: 10 ft

Step-by-step explanation:

The formula for the perimeter is ...

  P = 2(L +W)

We are also told the relation between length and width:

  W = 2L

Using these formulas with the given value of perimeter, we have ...

  30 = 2(L +2L)

  30 = 6L . . . . . . . simplify

  5 = L . . . . . . . . divide by 6

  W = 2(5) = 10 . . . find W using the value of L

The garden is 5 feet long and 10 feet wide.

Sonja [21]2 years ago
5 0

Answer:

Im not sure but i believe 60

Step-by-step explanation:

30x2=60

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Step-by-step explanation:

A:B:C

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Step-by-step explanation:

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8 0
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One sample has a mean of and a second sample has a mean of . The two samples are combined into a single set of scores. What is t
Murrr4er [49]

Answer:

a) For this case we can use the definition of weighted average given by:

M = \frac{ \bar X_1 n_1 + \bar X_2 n_2}{n_1 +n_2}

And if we replace the values given we have:

M = \frac{8*4 + 16*4}{4+4}= 12

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Step-by-step explanation:

Assuming the following question: "One sample has a mean of M=8 and a second sample has a mean of M=16 . The two samples are combined into a single set of scores.

a) What is the mean for the combined set if both of the original samples have n=4 scores "

For this case we can use the definition of weighted average given by:

M = \frac{ \bar X_1 n_1 + \bar X_2 n_2}{n_1 +n_2}

And if we replace the values given we have:

M = \frac{8*4 + 16*4}{4+4}= 12

b) what is the mean for the combined set if the first sample has n=3 and the second sample has n=5

Using the definition we have:

M = \frac{8*3 + 16*5}{3+5}= 13

c) what is the mean for the combined set if the first sample has n=5 and the second sample has n=3

Using the definition we have:

M = \frac{8*5 + 16*3}{5+3}= 11

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