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grandymaker [24]
3 years ago
9

The speed of sound in dry air at 20° C (68° F) is 1.236 × 103 km/h. What is the speed of sound written as an ordinary number?

Mathematics
1 answer:
defon3 years ago
7 0

Step-by-step explanation:

The speed of sound has nothing to do with "sea level" and sound pressure and without the medium air there is no speed of sound. In SI units with dry air at 20°C (68°F), the speed of sound c is 343 meters per second (m/s). This also equates to 1235 km/h, 767 mph, 1125 feet per second (ft/s), or 666 knots.

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This test is really hard for me in my opinion
pshichka [43]

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8 0
2 years ago
a certain test is worth 135 points. how many points (rounded to the nearest point) are needed to obtain a score of 85%?
yanalaym [24]

To obtain a score of 85% on a test worth 135 points, one needs to get 115 points. By using proportions, we get the required value.

<h3>How to write proportions?</h3>

A proportion is defined as an equality between two ratios.

Consider two ratios a:b and c:d. Then, the proportion we can write,

a: b = c : d

Then, the simplification we have for this proportion is

a/b = c/d or ad = bc

<h3>Calculation:</h3>

It is given that, a certain test is worth 135 points.

One to get 85% on this test, he/she needs to get X number of points.

So, we can write the proportions as

X : 135 = 85 : 100

⇒ X/135 = 85/100

⇒ X = 85/100 × 135

∴ X = 114.75 ≅ 115 points

Learn more about proportions at the following link:

brainly.com/question/140018

#SPJ4

7 0
9 months ago
The function notation f (x) means "f multiplied by x."<br> True<br> False
Digiron [165]
Your answer is True!!
6 0
3 years ago
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How much does 60% out of 100
Salsk061 [2.6K]

Answer:

60

Step-by-step explanation:

Given: 60% out of 100

Expressed mathematically:

= (60/100) x 100

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3 0
3 years ago
Which equation represents the distance (d) a car travels, in time (t), when driving 65 miles per hour? How far did the car trave
masha68 [24]

Answer:

195 miles

Step-by-step explanation

D = 65 x 3

5 0
3 years ago
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