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JulijaS [17]
3 years ago
13

What is the answer to 13-4(4+12•2)-1

Mathematics
2 answers:
adell [148]3 years ago
4 0

Answer:-100

Step-by-step explanation:

igor_vitrenko [27]3 years ago
4 0

Answer:

- 100

~Hope this helps!!

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The Student Monitor surveys 1200 undergraduates from 100 colleges semiannually to understand trends among college students. Rece
nlexa [21]

Answer:

A sample size of 385 is needed.

Step-by-step explanation:

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 - 0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

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.

You feel that a reasonable estimate of the standard deviation is 10.0 hours.

This means that \sigma = 10

What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?

A sample size of n is needed. n is found when M = 1. So

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

1 = 1.96\frac{10}{\sqrt{n}}

\sqrt{n} = 1.96*10

(\sqrt{n})^2 = (1.96*10)^2

n = 384.16

Rounding up:

A sample size of 385 is needed.

7 0
3 years ago
What values of x and y satisfy the system of equations {x = −2y + 1 | 13x + 8y = 11?}
Viefleur [7K]
Y= -2/-18 or Y= 0.1111
X=-2(-0.1111)+1
or X=0.77778
5 0
3 years ago
A zookeeper fills a bucket with f pounds of fish 4 times daily. If he carries 45 pounds
AveGali [126]
This question doesn’t really make sense but 3 of us figured out that the closest option is B 4f=45
4 0
3 years ago
A coin is tossed 12 times. What is the probability of getting heads exactly 7 times?
Anna71 [15]

Answer:

likely

Step-by-step explanation:

4 0
2 years ago
Identify which values are solutions of 4x-7>=-1
Mrrafil [7]

Answer:

x=1.5

or

x=1 1/2

Step-by-step explanation:

4x-7>-1

add 7 to both sides

4x=6

divide by 4 on both sides

x=1.5

or

x=1 1/2

5 0
2 years ago
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