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cupoosta [38]
2 years ago
6

How can 26n-7m+4(10n-6m)

Mathematics
1 answer:
Olenka [21]2 years ago
3 0

Answer:

66n-31m

Step-by-step explanation:

26n-7m+4(10n-6m)

26n-7m+40n-24m

66n-31m

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Lol i need help soemone halp
defon

Answer:

what is the question u are asking?

8 0
3 years ago
The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular st
Ipatiy [6.2K]

Answer:

We need a sample size of at least 101

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{1-0.99}{2} = 0.005

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 1-0.005 = 0.995, so z = 2.575

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.

What sample size is needed to estimate the true average speed to within 2 mph at 99% confidence?

We need a sample of at least n.

n is found when M = 2. So

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

2 = 2.575*\frac{7.8}{\sqrt{n}}

2\sqrt{n} = 2.575*7.8

\sqrt{n} = \frac{2.575*7.8}{2}

(\sqrt{n})^{2} = (\frac{2.575*7.8}{2})^{2}

n = 100.85

Rounding up

We need a sample size of at least 101

8 0
3 years ago
Read 2 more answers
Kelly has saved $35 to take music classes. She must pay a registration fee of $15 and then an additional $5 for each class. Whic
Alex Ar [27]

Answer:  

I would think 15c+5= 35 because it is the one answer that makes the most sense.  If you get this wrong I am so sorry.

5 0
2 years ago
Read 2 more answers
I need to know the answer plz
sergij07 [2.7K]

Answer:

the answer is c.

Step-by-step explanation:

8 0
2 years ago
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Jonah's and his aunt's houses are 8,750 meters apart. Jonah's walking speed is 5 kilometers per hour. How long will it take him
umka2103 [35]
8750 Meters = 8.75 Kilometers
8.75 Kilometers / 5 Kilometers Per Hour = 1.75 Hours = 1 Hour and 45 Minutes

Hope this helps.
5 0
3 years ago
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