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4 years ago

Ann started reading at 4:00 and finished at 4:20 p.M. Through what fraction of a circle did the minute hand turn?

Mathematics

1 answer:

nikitadnepr [17]4 years ago

6 0

Answer:

1/3

Step-by-step explanation:

Turned 20 minutes, so the minute hand turned 20 times per hour

There are 60 minutes in 1 hour, so the minute hand turns 60 times per hour

Therefore, the fraction is 20/60, simplified to 1/3

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Can someone help me with this? 20 points

lawyer [7]

Answer:

Step-by-step explanation:

Triangle ABC is a 45-45-90 right triangle. That means that segment BC also measures 10.

The big triangle as a whole is a 30-60-90. The side length across from the 30 degree angle is 10, so the whole length of BD is 10√3. However, since we already have the length of BC as 10, then segment CD measures

10√3 -10 which is 7.32

4 0

3 years ago

Which of the following expressions is equivalent to 3x + 3x + 5 + 5?

Kipish [7]

Remember
ab+ac=a(b+c0

3x+3x+5+5
2(3x)+2(5)
2(3x+5)

2nd option

4 0

4 years ago

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The number of failures of a testing instrument from contamination particles on the product is a Poisson random variable with a m

photoshop1234 [79]

Answer: 0.1353

Step-by-step explanation:

Given : The mean of failures = 0.025 per hour.

Then for 8 hours , the mean of failures = $\lambda=8\times0.25=2$ per eight hours.

Let X be the number of failures.

The formula to calculate the Poisson distribution is given by :_

$P(X=x)=\dfrac{e^{-\lambda}\lambda^x}{x!}$

Now, the probability that the instrument does not fail in an 8-hour shift :-

$P(X=0)=\dfrac{e^{-2}2^0}{0!}=0.1353352\approx0.1353$

Hence, the the probability that the instrument does not fail in an 8-hour shift = 0.1353

7 0

3 years ago

Find the geometric mean. 4a and a; 4a and 2a.

pishuonlain [190]

<span>Solve for "x":
a/x = x/4a
---
x^2 = 4a^2
x = 2a</span>

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4 years ago

At a conference of 250 people, 20% of the participants are French, 35% are Americans, 5% are Germans, and the rest are of other

yanalaym [24]

20% of 250 people are french.

0.2 * 250 = 50 people. Hope this helps!

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4 years ago

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