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Travka [436]
3 years ago
15

Find the area of the circle below. Use the formula Use 3.14 for pi.

Mathematics
2 answers:
kirill [66]3 years ago
6 0

Answer:

314

Step-by-step explanation:

Area is pie(r^2

10x10=100

100x3.14 is 314

hammer [34]3 years ago
3 0
I hope this is right but I think it’s 31.4
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Let us suppose we have data on the absorbency of paper towels that were produced by two different manufacturing processes. From
maksim [4K]

Answer:

The 95% CI for the difference of means is:

-155.45 \leq \mu_1-\mu_2 \leq -44.55

Step-by-step explanation:

<em>The question is incomplete:</em>

<em>"Find a 95% confidence interval on the difference of the towels mean absorbency produced by the two processes. Assumed that the standard deviations are estimated from the data. Round to two decimals places."</em>

Process 1:

- Sample size: 10

- Mean: 200

- S.D.: 15

Process 2:

- Sample size:  4

- Mean: 300

- S.D.: 50

The difference of the sample means is:

M_d=M_1-M_2=200-300=-100

The standard deviation can be estimated as:

\sigma_d=\sqrt{\frac{\sigma_1^2}{n_1}+\frac{\sigma_2^2}{n_2}}\\\\\sigma_d=\sqrt{\frac{15^2}{10}+\frac{50^2}{4}} =\sqrt{22.5+625}=\sqrt{647.5}=25.45

The degrees of freedom are:

df=n_1+n_2-2=10+4-2=12

The t-value for a 95% confidence interval and 12 degrees of freedom is t=±2.179.

Then, the confidence interval can be written as:

M_d-t\cdot \sigma_d\leq \mu_1-\mu_2 \leq M_d+t\cdot \sigma_d\\\\-100-2.179*25.45\leq \mu_1-\mu_2 \leq -100+2.179*25.45\\\\-100-55.45 \leq \mu_1-\mu_2 \leq -100+55.45\\\\ -155.45 \leq \mu_1-\mu_2 \leq -44.55

8 0
3 years ago
9282737 + 1881 x 19916 =
sweet-ann [11.9K]
Answer to this math equation: 46744733
5 0
2 years ago
Read 2 more answers
What is 8 1/2 +7 1/4= ?
Oliga [24]
The correct answer is 15.75
5 0
3 years ago
Read 2 more answers
Write 316.0 in standard form
alekssr [168]

Answer:

  316.0

Step-by-step explanation:

In the US, the given number is in standard form.

__

In the UK, "standard form" is what we refer to as "scientific notation" in the US. The number in standard form there is ...

  3.160×10²

4 0
3 years ago
Find the slope of the line through the given points (9,2) and (7,8)
Kipish [7]
The velocity, slope, of a line is always (y2-y1)/(x2-x1), in this case:

slope=(8-2)/(7-9)=6/-2=-3

m=-3
3 0
3 years ago
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