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3 years ago

Y-(-3y) Hey if you know the answer can you tell me please thanks

Mathematics

2 answers:

egoroff_w [7]3 years ago

4 0

Answer:

Step-by-step explanation:

Treat this question as if there are no ys because both of the values have ys in them.

So it would just be 1-(-3); the negatives cancel out and you get 4.

Now add the y back in for your final answer of 4y!

zloy xaker [14]3 years ago

3 0

Answer:

It's 4y!

Step-by-step explanation:

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The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customer

Katena32 [7]

Answer:

Margin of error = 0.196

Step-by-step explanation:

We are given that the manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3 minutes. It is known that the standard deviation of the population of checkout times is 1 minute.

That means; Sample size, n = 100

Population standard deviation = 1 minute

Sample mean = 3 minutes

Now, the Margin of error means how much deviation is there from the sample mean to calculate the confidence interval for true population mean.

Margin of error formula is given by = $Z_\frac{\alpha}{2} \times \frac{\sigma}{\sqrt{n} }$

where, $\sigma$ = population standard deviation

n = sample size of customers

$\alpha$ = significance level = 5%

Now, the z probability area at 5% significance level is given to be 1.96 from z table.

So, Margin of error = $1.96 \times \frac{1}{\sqrt{100} }$ = $\frac{1.96}{10}$ = 0.196 .

Therefore, with a .95 probability, the sample mean will provide a margin of error of 0.196 .

7 0

3 years ago

Which of the following is NOT approximately equivalent to one of the metric units

dmitriy555 [2]

Answer:

Poundsis not equivalent to one of the metric units, that is WEIGHT.

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4 years ago

--- Find each missing length to the nearest tenth. ----

Dafna1 [17]

Answer:

the answer missing length is 7.6 and yes i rounded it to the nearest tenth.

Step-by-step explanation:

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3 years ago

The diameter of a circle has endpoints (-10,5) and (-4,11)

Marta_Voda [28]

well, since we know the endpoints for the diameter, its midpoint will be where the center of the circle is located, so

$~~~~~~~~~~~~\textit{middle point of 2 points } \\\\ (\stackrel{x_1}{-10}~,~\stackrel{y_1}{5})\qquad (\stackrel{x_2}{-4}~,~\stackrel{y_2}{11}) \qquad \left(\cfrac{ x_2 + x_1}{2}~~~ ,~~~ \cfrac{ y_2 + y_1}{2} \right) \\\\\\ \left(\cfrac{ -4 -10}{2}~~~ ,~~~ \cfrac{ 11 + 5}{2} \right)\implies \left(\cfrac{-14}{2}~~,~~\cfrac{16}{2} \right)\implies \stackrel{center}{(-7~~,~~8)}$

and if we get the distance between those endpoints, and take half of that, that'd be the radius of it.

$~~~~~~~~~~~~\textit{distance between 2 points} \\\\ (\stackrel{x_1}{-10}~,~\stackrel{y_1}{5})\qquad (\stackrel{x_2}{-4}~,~\stackrel{y_2}{11})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ \stackrel{diameter}{d}=\sqrt{[-4 - (-10)]^2 + [11 - 5]^2}\implies d=\sqrt{(-4+10)^2+6^2} \\\\\\ d=\sqrt{6^2+6^2}\implies d=\sqrt{72}~\hfill \stackrel{radius=half~that}{\cfrac{\sqrt{72}}{2}} \\\\[-0.35em] ~\dotfill$

$\textit{equation of a circle}\\\\ (x- h)^2+(y- k)^2= r^2 \qquad center~~(\stackrel{-7}{ h},\stackrel{8}{ k})\qquad \qquad radius=\stackrel{\frac{\sqrt{72}}{2}}{ r} \\\\\\\ [x-(-7)]^2~~ + ~~[y-8]^2~~ = ~~\left( \frac{\sqrt{72}}{2} \right)^2\implies (x+7)^2~~ + ~~(y-8)^2~~ = ~~18$

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2 years ago

Convert 23 days to weeks and days?

dezoksy [38]

Answer:

3 weeks and 2 days

Step-by-step explanation:

6 0

3 years ago