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Nikitich [7]
3 years ago
5

WILLING TO HELP SOMEONE OUT?? GOOD AT ALGEBRA 2?? THEN COME TO THIS QUESTION AND ANSWER IT!! ALL HELP IS APPRECIATED.

Mathematics
2 answers:
Anna71 [15]3 years ago
8 0
A = m^2 - 9m
B = 1 - 9m^2

2A - B
2(m^2 - 9m) - 1 - 9m^2
2m^2 - 18m - 1 - 9m^2
Combine liked terms
-7m^2 - 18m - 1

Answer:
-7m^2 - 18m - 1

(Hopefully this is what you’re asking for)
jarptica [38.1K]3 years ago
5 0
Wouldnt it be -7m^2-18-1
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Can someone help me I'm confused<br><br> 8 - 1/3x = 16<br><br> Two-step equation
Cloud [144]
<span>8 - 1/3x = 16
</span>⇒ -1/3x= 16-8
⇒ -1/3x= 8
⇒ x= -24

The final answer is -24~
8 0
3 years ago
The Information Technology Department at a large university wishes to estimate the proportion of students living in the dormitor
nadya68 [22]

Answer:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by \alpha=1-0.99=0.01 and \alpha/2 =0.005. And the critical value would be given by:

z_{\alpha/2}=-2.58, z_{1-\alpha/2}=2.58

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.05 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

We can use as an estimator for p \hat p =0.5. And replacing into equation (b) the values from part a we got:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

3 0
3 years ago
Your food costs are 2250. Your total food sales are 25000. What percent of your food sales do the food costs represent?
liberstina [14]
To get this percentage, divide costs by total food sales

2250 / 25000 = 0.09

then multiply by 100 to get the % = 9%
6 0
3 years ago
Read 2 more answers
A monument in the shape of a right triangle sits on a rectangular pedestal that is 5 meters high by 11 meters long. The longest
Ivan
51 height plus to Expedia’s ik
6 0
2 years ago
Read 2 more answers
I need help a,b,or c
horrorfan [7]

Answer:

B, 150

Step-by-step explanation:

use pythagorean theorem, the sides of the triangle are 120 and 90, so when u  square them and add them together, you get 120^2 +90^2 = 22500

square root 22500 to find the hypotanuse which is the length from one corner to another. the anwser is 150m which is b

4 0
2 years ago
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