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bekas [8.4K]
3 years ago
6

Ali simplifies the expression 9y+y to 9y2. why is she wrong?

Mathematics
2 answers:
Scorpion4ik [409]3 years ago
7 0
<span>9y+y = y(9 + 1) = 10y
answer is 10y

if </span><span>9y^2 then it should be 9y times y = 9y^2

hope it helps</span>
LiRa [457]3 years ago
3 0

Answer:

the answer is 10y

Step-by-step explanation:

they reason why she is wrong  is because in this answer, there would be no power involved. hope this works. have a great day!

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R - chart

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A hardware store owner has 1,152 screws. If she wants to put them in packages of 32, how many packages can she make?
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3 years ago
The National Center for Educational Statistics surveyed 5400 college graduates about the lengths of time required to earn their
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Answer:

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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{1-0.9}{2} = 0.05

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

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

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.

M = 1.645*\frac{1.9}{\sqrt{4500}} = 0.04

The lower end of the interval is the sample mean subtracted by M. So it is 5.4 - 0.04 = 5.36 years.

The upper end of the interval is the sample mean added to M. So it is 5.4 + 0.04 = 5.44 years.

The 90% confidence interval for the mean time required by all college graduates is between 5.36 years and 5.44 years.

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The travel time for a plane traveling at a rate of r kilometers per hour for 290 kilometers
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