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3 years ago

ALGEBRA 2 QUESTION!!!! HELP?!?!?!?!

Mathematics

1 answer:

Mariana [72]3 years ago

4 0

Those are right ...........................

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How to Evaluate: (6 + 2 )^3 - 12

Lina20 [59]

Answer: 500

Step-by-step explanation:

(8)^3 - 12

512-12 = 500

3 0

3 years ago

The amount of time workers spend commuting to their jobs each day in a large metropolitan city has a mean of 70 minutes and a st

Zepler [3.9K]

Answer:

At least 75% of these commuting times are between 30 and 110 minutes

Step-by-step explanation:

Chebyshev Theorem

The Chebyshev Theorem can also be applied to non-normal distribution. It states that:

At least 75% of the measures are within 2 standard deviations of the mean.

At least 89% of the measures are within 3 standard deviations of the mean.

An in general terms, the percentage of measures within k standard deviations of the mean is given by $100(1 - \frac{1}{k^{2}})$ .

In this question:

Mean of 70 minutes, standard deviation of 20 minutes.

Since nothing is known about the distribution, we use Chebyshev's Theorem.

What percentage of these commuting times are between 30 and 110 minutes

30 = 70 - 2*20

110 = 70 + 2*20

THis means that 30 and 110 minutes is within 2 standard deviations of the mean, which means that at least 75% of these commuting times are between 30 and 110 minutes

8 0

3 years ago

The propeller blades on a submarine have a radius of 6 feet. At full speed, they turn at 120 revolutions per minute. What is the

Kamila [148]

One revolution also corresponds to an angular displacement of 2π rad.

So, the angular velocity is

120 rev/min = (120 rev/min) * (2π rad/rev) = 240π rad/min

5 0

3 years ago

Read 2 more answers

a, b, and c represent three different digits. If you add up all of the six two - digit numbers that can be written with these di

uysha [10]

Answer:

The answer is 7, 8 and 9. The Two-digit numbers are: ab, ac, ba, bc, ca, cb

The Sum of them is: 10a + b + 10a + c + 10b + a + 10b + c + 10c + a + 10c + b = 528

22a + 22b + 22c = 528

a + b + c = 528/22

a + b + c = 24 The only option of three different digits with the sum of 24 is 7, 8 and 9.

Hope this helps, stay safe, and merry christmas!

4 0

3 years ago

Prove the following<br><br> please help

zhenek [66]

Step-by-step explanation:

1. cos x sec x

Secant is the inverse of cosine.

= cos x (1 / cos x)

= 1

2. sin x csc x

Cosecant is the inverse of sine.

= sin x (1 / sin x)

= 1

7 0

4 years ago