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lukranit [14]
4 years ago
9

What number must be added to the expression below to complete the square?

Mathematics
1 answer:
igomit [66]4 years ago
4 0
When Completing the square you take the 'b' term and divide it by 2, then square it.
3/2, (3/2)^2 = 9/4
Letter C
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What’s the correct answer for this question?
zhannawk [14.2K]

Answer:

D

Step-by-step explanation:

It would be a cone with a radius of 4 units rotating around y-axis.

6 0
4 years ago
How to calculate standard deviation given mean and sample size?
ad-work [718]
In addition to mean and sample size you will need the individual scores.

The formula for standard deviation is:

S^2 = E(X-M)^2/N-1

Here's an example: 
Data set: 4,4,3,1
Mean: 3
Sample size: 4

First, put the individual scores one after the other and subtract the mean from it.
4 - 3 = 1
4 - 3 = 1
3 - 3 = 0
1 - 3 = -2

Second, square the answers you got from step 1. 
1^2 = 1
1^2 = 1
0^2 = 0
-2^2 = 4
Third, plug the values from step 2 into the formula. 

S^2 = (1+1+0+4)/(4-1) = 6/3 = 2

Standard deviation = 2
3 0
3 years ago
What is the probability of rolling a 3 on two consecutive rolls of a fair 6-sided die?
Ad libitum [116K]

Answer:

\frac{1}{36} chance

Step-by-step explanation:

Each time you roll a die, you have a \frac{1}{6} chance of rolling a 3. It's even rarer to roll two 3s in a row, and to find a consecutive probability, we have to multiply the two probabilities. In this case, both probabilities are \frac{1}{6}.

\frac{1}{6}\cdot\frac{1}{6}=\frac{1}{36}

Hope this helped!

4 0
3 years ago
If I have something like -x^2 when I plug the number in, will it be positive or negative and why
MrRissso [65]
The order of operations tells you exponentiation is done before multiplication or addition. That is, the value of x is squared before the sign is applied.

Your result will be negative for any non-zero value of x.
4 0
3 years ago
To play the lottery in a certain state, a person has to correctly select 5 out of 45 numbers, paying a $1 for each five-number s
defon

There are 45 numbers out of which 5 numbers are required to win an enormous sum of money

No of ways  in which 5 numbers can be selected out of 45 numbers.

C_{45}^5=\frac{45!}{40!5!} =1221759

out of which there is only combination foe contest winning

P=\frac{1}{1221759}

When 100 different tickets are bought then

Probability of winning: \frac{100}{1221759}

Probably of winning≈0,000082

/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

P.S. Hello from Russia :^)

4 0
3 years ago
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