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4 years ago

Evaluate the expression using the order of operations. 14 + (40 - 6) ÷ 2

Mathematics

2 answers:

laiz [17]4 years ago

7 0

40-6 is 34
34 divided by 2 is -7
14+17 is 31

ANSWER: 31

mr Goodwill [35]4 years ago

6 0

Answer : 31 !!!!!!!!!!!!!!

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A 98% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit. A prelimina

BaLLatris [955]

Answer:

$n = (\frac{2.326*1.7}{0.3})^2= 173.73$

And the value for n rounded up would be n = 174

Step-by-step explanation:

We have the following info given:

$s= 1.7$ previous estimation for the deviation

$ME=0.03$ the margin of error desired

$Conf =0.98$ represent the confidence

The Margin of error is given by:

$ME = z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$

If we solve for the value of n we got:

$n= (\frac{z*\sigma}{ME})^2$

For this problem we know that the confidence is 98% so then the significance level would be $\alpha=0.02$ and the critical value would be:

$z_{\alpha/2}= 2.326$

And replacing we got:

$n = (\frac{2.326*1.7}{0.3})^2= 173.73$

And the value for n rounded up would be n = 174

3 0

3 years ago

Sam and Harry are family. Sam is currently is three times Harry's age. Sam's age is also 10 more than twice Henry's age. What ar

kramer

Answer:

<em>Sam is 30 years old, and Harry is 10 years old.</em>

Step-by-step explanation:

Let us assume that the age of Sam is x and the age of Harry is y.

Sam is currently is three times Harry's age.

So, $x=3y$ ----------------------1

Sam's age is also 10 more than twice Harry's age.

so, $x=2y+10$ ---------------2

Subtracting 2 from 1, we get

$\Rightarrow x-x=3y-2y-10$

$\Rightarrow 0=y-10$

$\Rightarrow y=10$

putting this in equation 1,

$x=3(10)=30$

Therefore, Sam is 30 years old, and Harry is 10 years old.

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3 years ago

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goldfiish [28.3K]

The true statement about her method would be to start at the origin. But you would go up 4 spaces you would go to the right 4 spaces.

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3 years ago

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What is the surface area of this cylinder?

Cloud [144]

Answer:

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Top surface area T = 12.566370614359 yd^2

Base surface area B = 12.566370614359 yd^2

Total surface area A = 75.398223686155 yd^2

Step-by-step explanation:

5 0

4 years ago

Can anybody help me please

inn [45]

Answer:

(2,5)

Step-by-step explanation:

It's the coordinates of the point where the lines cross

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3 years ago

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