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S_A_V [24]
2 years ago
14

Pleaseee helppp meeeeee

Mathematics
1 answer:
Alinara [238K]2 years ago
3 0
I think its either A or C. Leaning more to A. Do you think you could explain the question just a bit more?
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Students at a middle school are divided into 6th, 7th, and 8th grades. A random sample of 15 students from each grade is chosen.
Julli [10]

Answer:

B. Stratified random sample is the correct answer

4 0
2 years ago
A=zm+z solve for m please help!!!!!
Svetach [21]

Answer:

(a-z)/z = m

Step-by-step explanation:

a = zm+z

Subtract z from each side

a-z = mz+z-z

a-z = mz

Divide by z

(a-z) /z = mz/z

(a-z)/z = m

5 0
3 years ago
Please answer correctly! I will mark you Brainliest!
weeeeeb [17]

Answer:

4.1 inches

<u>I would appreciate Brainliest, but no worries.</u>

4 0
3 years ago
Read 2 more answers
How many times longer is the wavelength of a sound wave with a frequency of 20 waves per second than the wavelength of a sound w
sergejj [24]

The sound wave with a <u>frequency of 20</u> waves/sec is 800 longer than the wavelength of a sound wave with a <u>frequency of 16,000</u> waves/sec

<h3>Calculating wavelength </h3>

From the question, we are to determine how many times longer is the first sound wave compared to the second sound water

Using the formula,

v = fλ

∴ λ = v/f

Where v is the velocity

f is the frequency

and λ is the wavelength

For the first wave

f = 20 waves/sec

Then,

λ₁ = v/20

For the second wave

f = 16,000 waves/sec

λ₂ = v/16000

Then,

The factor by which the first sound wave is longer than the second sound wave is

λ₁/ λ₂ = (v/20) ÷( v/16000)

= (v/20) × 16000/v)

= 16000/20

= 800

Hence, the sound wave with a <u>frequency of 20</u> waves/sec is 800 longer than the wavelength of a sound wave with a <u>frequency of 16,000</u> waves/sec

Learn more on Calculating wavelength here: brainly.com/question/16396485

#SPJ1

6 0
1 year ago
Which rigid motion would map triangle ABC onto triangle A'B'C'?
Gelneren [198K]
It would be choice 1 since when rotated all of the points would match up.
3 0
3 years ago
Read 2 more answers
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