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3 years ago

PLEASE HELP ILL GIVE U BRAINLEST PLUS 50 POINTS IF U GET IT RIGHT

Mathematics

2 answers:

nikklg [1K]3 years ago

8 0

Answer:

$-10x^{2}-9x-6$

Step-by-step explanation:

Combining like terms:

$-7x^{2}-3x^{2}-10x+x-6$

$-10x^{2}-9x-6$

natta225 [31]3 years ago

3 0

-7X2-10x-6-3X2+X is the answer

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From a population of 200 elements, the standard deviation is known to be 14. A sample of 49 elements is selected. It is determin

jeka94

Answer:

a. 2

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean $\mu = p$ and standard deviation $s = \sqrt{\frac{p(1-p)}{n}}$

Standard deviation is known to be 14.

This means that $\sigma = 14$

Sample of 49

This means that $n = 49$

The standard error of the mean is

$s = \frac{\sigma}{\sqrt{n}} = \frac{14}{\sqrt{49}} = \frac{14}{7} = 2$

So the correct answer is given by option a.

5 0

3 years ago

If -(x - 1) = 5, find the value of -4x. Show your work.<br> PLEASEEEE !!!

irakobra [83]

Answer: x=-4

Step-by-step explanation:

1. Simplify:

-(x-1)=5 => -x+1=5

Isolate x:

-x=5-1 => -x=4 => x=-4

7 0

3 years ago

Explain how you found your answer

bogdanovich [222]

Answer:

29°

Step-by-step explanation:

151° + a=180°

We know the sum of angles in a straight line is 180°

a= 180°-151°

The sign changed as it changed sides

a= 29°

5 0

3 years ago

The manager of a radio station decides that on each successive evening (7 days per week), a Beethoven piano sonata will be playe

VashaNatasha [74]

Answer:

3 years, 11 months and 10 days

Step-by-step explanation:

Beethoven wrote

32 piano sonatas

9 symphonies

5 piano concertos

By the fundamental principle of counting there are

32 times 9 times 5 ways of combining these pieces in the required order.

32 times 9 times 5 = 1,440

As there are 365 days in a year, the policy decided by the manager could be continued during

1,440/365 = 3.9452 years.

But 3.9452 years = 3 years + 0.9452 years.

As 1 year equals 12 months

0.9452 years = 11.3424 months

11.3424 months = 11 months+0.3424 months

As 1 month = 30 days

0.3424 months = 10.27 days = 10 days rounded to the nearest integer

So, the manager could continue this policy for

3 years, 11 months and 10 days without repeating the program.

8 0

3 years ago

What is the Desmos Graphing App for Algebra and how do you use it. Is it a computer thing or do you download it on your phone?

elixir [45]

Deseos Graphing is a website
But you also download the app on your phone
You put in the equation you want to see graphed

5 0

4 years ago

Read 2 more answers