Eight subtracted from four times a number is -120?

Mathematics

2 answers:

Vsevolod [243]2 years ago

5 0

-28 because if you add 8 to -120 you get -112 then divide it by 4 and you got -28

Zarrin [17]2 years ago

5 0

Add back the 8 to see what it was before the problem is solved. -120+8=112 the divide by 4 cause it’s the opposite of multiplying. -112/4=-28 and you can go back and check it by doing -28*4=-112-8=-120

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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

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1 year ago

Miguel and Kat are reading the same book. Miguel reads 5 times as many

n200080 [17]

Answer:

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