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Darya [45]
3 years ago
10

V=pi*r^2h solve for pi*

Mathematics
1 answer:
astraxan [27]3 years ago
4 0

Answer:

π or pi is 22÷7 or 3.14. U can't find it. U have to by-heart the value or it will be given in question

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Six times a number is decreased by 5, the result is 19.what is the number?
marishachu [46]
Simple...

6x-5=19

x= 19+5
 = 24
x= 24/6
  = 4

Thus, your answer is 4.

Hope This Helps!
6 0
3 years ago
Find the unit rate.
marusya05 [52]

Answer:

4

Step-by-step explanation:

8/2=4

hope this helps :3

if it did pls mark brainliest

7 0
3 years ago
Read 2 more answers
I've already saved $68 for the $200 video game system. How many hours does raj need to work to earn the remainder of the money h
gladu [14]

Total amount needed for the video game = $200

Total amount of money saved = $68

Amount of money that is needed to be saved = 200-68  =132

So raj needs to work additional hours in order to earn the remaineder$132 for the video game

Hourly wage = $5.5

So, number of hours that Raj needs to work to earn $132 = $132/5.5 = 24 hours

Number of hours that Raj needs to work to earn the remainder of the money  = 24 hours


6 0
3 years ago
A particular psychological test is used to measure need for achievement. The average test score for all university students in O
Angelina_Jolie [31]

Answer:

Only B and C are always true.

Step-by-step explanation:

To analyse which statements are always true, we go through the process of finding confidence intervals for sample means, from the start.

Confidence Interval = (Sample mean) ± (Margin of error)

From this expression, it is evident that the margin of error determines how wide the confidence interval would be.

Sample Mean = 110 (given)

Margin of Error = (Critical value) × (Standard deviation of the distribution of sample means)

Since no information about the population standard deviation is provided, the critical value is obtained using t-distribution.

The critical value usually varies at different confidence levels and degree of freedoms.

The higher the confidence level, the higher the critical value and the higher the margin of error leading to a wider range.

Hence, a confidence interval of 95% will have a higher critical value than a confidence interval of 90%. Hence, statement C is proved once that 'for n = 100, the 95% confidence interval will be wider than the 90% confidence interval'.

After obtaining the critical value, we then obtain the standard deviation of the distribution of sample means or simply the standard error of the mean. This is given as

σₓ = σ/√n

where σ = standard deviation; which isn't given. The standard deviation might be high enough to guarantee that the Margin of error is high too for the confidence interval to contain 115 or low enough to ensure that the Margin of error is very small and the confidence interval will not contain 115.

Or the sample size might be high enough to make the standard error of the mean to be eventually small and lead to a small margin of error and the condidence interval will not contain 115.

The point is, it isn't always sure that the resulting interval.would contain 115. So, statement A isn't always true.

Then from σₓ = σ/√n,

n = sample size, a large sample size means a more narrow confidence interval and a small sample size means a wider sample size. This proves statement C.

The 95% confidence interval for n = 100 will be more narrow than the 95% confidence interval for n = 50.

Hence, Only B and C are always true.

Hope this Helps!!!

5 0
3 years ago
Drag each equation to show if it could be a correct first step to solving the equation
Vlad [161]
Tell me what the answer
4 0
3 years ago
Read 2 more answers
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