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schepotkina [342]
3 years ago
7

I need help please!! Can’t figure this out

Mathematics
1 answer:
Advocard [28]3 years ago
4 0

Answer:

-6( 2-r ) = 42

-12 + 6r = 42

6r = 42 + 12

6r = 54

r = 9

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When the positive integer n is divided by 7, the remainder is 2. What is the remainder when 5n is divided by 7?
ser-zykov [4K]

Therefore the reminder is 3 when 5n is divided by 7.

Step-by-step explanation:

we know that

Dividend = quotient × Divisor +Reminder

⇔ n = Q(n) × 7 + 2          [ let Q(n)  is quotient]

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⇔ 5n = (5Q(n) +1) × 7 +3

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6 0
4 years ago
A statistics teacher taught a large introductory statistics class, with 500 students having enrolled over many years. The mean s
soldi70 [24.7K]

Answer:

The teacher select a sample of n =15 students.  And he wanted to know if teaching a smaller class was more effective and students performed better, that means if \mu >78 and he obtaind a sample mean of \bar X>83.

Based on this the correct system of hypothesis are:

Null hypothesis: \mu =78

Alternative hypothesis: \mu >78

And the best option for this case is:

a. H0:\mu=78 vs. H1:\mu>78 .

Step-by-step explanation:

For this case we have the following previous info given:

\mu = 78 represent the true mean

\sigma =10 represent the true deviation

The teacher select a sample of n =15 students.  And he wanted to know if teaching a smaller class was more effective and students performed better, that means if \mu >78 and he obtaind a sample mean of \bar X>83.

Based on this the correct system of hypothesis are:

Null hypothesis: \mu =78

Alternative hypothesis: \mu >78

And the best option for this case is:

a. H0:\mu=78 vs. H1:\mu>78 .

5 0
3 years ago
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