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gregori [183]
2 years ago
8

Helppp meee please this one confuses me

Mathematics
2 answers:
Andrej [43]2 years ago
4 0

Step-by-step explanation:

==(3x + 2)(x + 1) \\  = 3x(x + 1) + 2(x + 1) \\  =  {3x}^{2}  + 3x + 2x + 2 \\   = {3x}^{2}  + 5x + 2

slega [8]2 years ago
4 0

Answer:

Bro really?? Anyway it's

anyway \: its \: 3x { }^{2}  + 3x + 2x + 2

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Dafna1 [17]
That would be y = -3.
4 0
3 years ago
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marysya [2.9K]

Answer:

I think it is E and C

Step-by-step explanation:

E) y - 6 = -7/4(x+5)

(-5,6)

6-6=-7/4(0)

0=0

(-1,-1)

-1-6=-7/4(-1+5)

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5 0
2 years ago
Suppose a 90% confidence interval for the mean salary of college graduates in a town in Mississippi is given by [$38,737, $50,46
JulsSmile [24]

Answer:

a. The point estimate was of $44,600.

b. The sample size was of 16.

Step-by-step explanation:

Confidence interval concepts:

A confidence interval has two bounds, a lower bound and an upper bound.

A confidence interval is symmetric, which means that the point estimate used is the mid point between these two bounds, that is, the mean of the two bounds.

The margin of error is the difference between the two bounds, divided by 2.

a. What is the point estimate of the mean salary for all college graduates in this town?

Mean of the bounds, so:

(38737+50463)/2 = 44600.

The point estimate was of $44,600.

b. Determine the sample size used for the analysis.

First we need to find the margin of error, so:

M = \frac{50463-38737}{2} = 5863

Relating the margin of error with the sample size:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.9}{2} = 0.05

Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a pvalue of 1 - 0.05 = 0.95, so Z = 1.64.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

For this problem, we have that \sigma = 14300, M = 5863. So

M = z\frac{\sigma}{\sqrt{n}}

5863 = 1.645\frac{14300}{\sqrt{n}}

5863\sqrt{n} = 1.645*14300

\sqrt{n} = \frac{1.645*14300}{5863}

(\sqrt{n})^2 = (\frac{1.645*14300}{5863})^2

n = 16

The sample size was of 16.

7 0
3 years ago
How many triangles can the polygon below be divided into? A polygon with 10 sides. 6 7 8 9
Dominik [7]

Answer:

240

I think I'm not sure but try

8 0
3 years ago
Hey can you please help me posted picture of question
sasho [114]
The correct answer is option D.

F(G(x)) denotes the composition of the two functions F(x) and G(x). The composition of two functions result in x, if the two functions are inverses of each other. So in this case F(x) and G(x) will be the inverse of each other. So option D is the correct answer.
7 0
3 years ago
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