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larisa86 [58]
3 years ago
9

What is the speed of a wave if the wavelength is 100 m and the period is 20 seconds?

Mathematics
2 answers:
Tanzania [10]3 years ago
7 0
I’m pretty sure it’s D because 20\100 is 5 .

I hope this helped !!!

mafiozo [28]3 years ago
7 0
The answer is D 5 m/s
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It takes 15 hours for 4 men to paint a room.
kolezko [41]

Answer:

6

Step-by-step explanation:

If there was one man, he would have taken 15×4= 60 hours

To complete the job in 10 hours, 60÷10 = 6 men will be needed

6 0
4 years ago
The line inside this circle is its
Alex777 [14]
The answer will be (D)
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3 years ago
Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence i
mash [69]

Complete Question

A biologist reports a confidence interval of (3.5,4.9) when estimating the mean height (in centimeters) of a sample of seedlings. What is the estimated margin of error and the sample mean?

Answer:

The  margin of error is  E = 0.7

The  sample mean is  \=  x  =  4.2

Step-by-step explanation:

from the question we are told that

   The  upper limit is  k  =  4.9

    The  lower limit is  r = 3.5

Generally the margin of error is mathematically represented as

      E =  \frac{k - r}{ 2}

      E = \frac{ 4.9  -  3.5 }{2}

     E = 0.7

Generally the sample mean is mathematically evaluated as

        \=  x = k  -  E

=>    \= x  =  4.9 - 0.7

=>    \=  x  =  4.2

4 0
3 years ago
Allison and Lindsey each measured their bedrooms for new carpeting. They found
Pavel [41]

Answer:

Step-by-step explanation:

Let's assume that the length of a side of Allison's room as x

So, Lindsey's room = x + 3

If Lindsey's room needs 225 sq. feet of carpeting, then   x + 3 = \sqrt{225}

So, x + 3 = 15

Therefore, x = 15 - 3 = 12 ( So, Allison's room has a side of length 12)

Therefore, the carpeting needed = 12 × 12 = 12² = 144 sq. feet

There's your answer!

6 0
3 years ago
The cost of 10 yearbooks $250 what is the cost of one yearbook
Ierofanga [76]
$25 per yearbook

The cost is x and the amount is 10
So the equation is 10x=$250
Divide 250 by 10 and get 25
6 0
3 years ago
Read 2 more answers
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