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emmasim [6.3K]
3 years ago
15

Just need to know what x is

Mathematics
1 answer:
crimeas [40]3 years ago
5 0
X= 4

Because I need to answer a question in order to answer other questions so your welcome.
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there are 63 students marching in a band, and they'are marching in 7 rows. how many students are in each row?
photoshop1234 [79]

To find the number or rows, divide the total number of students by the number in each row.

63 / 7 = 9 rows.

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3 years ago
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Identify the domain, range, and codomain in each graph. Then use the codomain and range to determine whether the
bearhunter [10]

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13

Step-by-step explanation:

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3 years ago
1. Find the 90% Cl for the population mean if sample
Elden [556K]

Answer:

The answer is below

Step-by-step explanation:

1)

mean (μ) = 12, SD(σ) = 2.3, sample size (n) = 65

Given that the confidence level (c) = 90% = 0.9

α = 1 - c = 0.1

α/2 = 0.05

The z score of α/2 is the same as the z score of 0.45 (0.5 - 0.05) which is equal to 1.65

The margin of error (E) is given as:

E=Z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} } =1.65*\frac{2.3}{\sqrt{65} } =0.47

The confidence interval = μ ± E = 12 ± 0.47 = (11.53, 12.47)

2)

mean (μ) = 23, SD(σ) = 12, sample size (n) = 45

Given that the confidence level (c) = 88% = 0.88

α = 1 - c = 0.12

α/2 = 0.06

The z score of α/2 is the same as the z score of 0.44 (0.5 - 0.06) which is equal to 1.56

The margin of error (E) is given as:

E=Z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} } =1.56*\frac{12}{\sqrt{45} } =2.8

The confidence interval = μ ± E = 23 ± 2.8 = (22.2, 25.8)

8 0
3 years ago
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vovikov84 [41]

Answer:

X<-5

Step-by-step explanation:

1) open the brackets

2) take -35 to the other side with -10

where it turns to be -5X<-10+35

3) work out to find -5X<25

4) divide both sides by -5

to find X<-5

3 0
3 years ago
In a standard deck of cards, there are 26 different red cards. How many possible combinations of 5 red cards
Oksi-84 [34.3K]

Step-by-step explanation:

It doesn't matter what order they are drawn in, so youi have a combination problem

26C5

My calculator gives the answer directly,

It is 65780

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3 years ago
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