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3 years ago

5 x + 4y= 16 X+y = 3.5 Find out what each letter is equal to X= Y=

Mathematics

1 answer:

klemol [59]3 years ago

5 0

X=4
Y=-0.5

Do you need an explanation?

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Nina received two emails on Monday every day that she received one more than twice as mini as the day before how many emails did

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2 years ago

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If the lines in a system of equations have different slopes and the same y-intercept, how many solutions does the system have?

allochka39001 [22]

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289819

Step-by-step explanation:

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2 years ago

A large on-demand, video streaming company is designing a large-scale survey to determine the mean amount of time corporate exec

Firdavs [7]

Answer:

554 executives should be surveyed.

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 Z-table as such z has a p-value 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.

Standard deviation of 3 hours.

This means that $\sigma = 3$

The 95% level of confidence is to be used. How many executives should be surveyed?

n executives should be surveyed, and n is found with $M = 0.25$ . So

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

$0.25 = 1.96\frac{3}{\sqrt{n}}$

$0.25\sqrt{n} = 1.96*3$

$\sqrt{n} = \frac{1.96*3}{0.25}$

$(\sqrt{n})^2 = (\frac{1.96*3}{0.25})^2$

$n = 553.2$

Rounding up:

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3 years ago

Pls help solve<br> find t

IgorC [24]

Answer:

-t = -8 ×5

-t = -40

t= 40

good luck have a nice day

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2 years ago

Jason has a piece of wire that is 63.9 inches long. He cuts the wire into 3 equal places. Estimate the length of one piece of wi

Shtirlitz [24]

Answer: 21.3

Step-by-step explanation:

63.9 divided by 3 equal pieces is 21.3!

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3 years ago