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Shkiper50 [21]
2 years ago
7

Read the following problem: "Find the number, if the sum of 9 and a half a number equals 35." Which of the following translation

s is correct?
9 + x + 2 = 35
9 + 2x = 35
9 +35 = 2x
None of these choices are correct.
Mathematics
1 answer:
Lapatulllka [165]2 years ago
6 0
Answer:

None of these choices are correct.

Step-by-step explanation:

Because half a number that will equal 35 would look like x/2 = 35

Therefore, none of the choices are correct

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In a study to establish the absolute threshold of hearing, 80 male college freshmen were each seated in a soundproof room and a
Norma-Jean [14]

Answer:

Step-by-step explanation:

Hello!

To study the threshold of hering the researcher took a random sample of 80 male college freshmen.

The students underwent an audiometry test where a tome was played and they had to press a button when they detected it.  The researcher recorded the lowest stimulus level at which the tone was detected obtaining a sample mean of X[bar]= 22.2 dB and a standard deviation of S= 2.1 dB

To estimate the population mean, since we don't have information about the variable distribution but the sample size is greater than 30, you can use the approximation of the standard normal distribution:

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Where the semiamplitude or margin of error of the interval is:

d= Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Using a 95% level Z_{0.975}= 1.965

d= 1.965 * \frac{2.1}{\sqrt{80} }

d= 0.46

The point estimate of the population mean of the threshold of hearing for male college freshmen is X[bar]= 22.2 db

And the estimation using a 95%CI is [21.74;22.66]

I hope this helps!

8 0
3 years ago
Give a big-o estimate for the number of operations (where an operation is an addition or a multiplication) used in this segment
Marianna [84]
We have a "rectangular" double loop, meaning that both loops go to completion.
So there are 3*4=12 executions of t:=t+ij.

Assuming two operatiions per execution of the innermost loop, (i.e. ignoring the implied additions in increment of subscripts), we have 12*2=24 operations in all.

Here the number of operations (+ or *) is exactly known (=24). 

Big-O estimates are used for cases with a varying scale of operations, governed by a variable (usually n) to indicate the sensitivity of the number of operations relative to a change in the size of n.

Here we do not have a scale, nor n is defined.  The number of operations is constant and known at 24.   So a variable is required to find the big-O estimate.
6 0
3 years ago
You bought a pumpkin pie for Friendsgiving. At the end of the part 6/8 of the pumpkin pie was left. The host decided to share ou
ExtremeBDS [4]
The correct answer is D
6/8 divided by 4 is 3/16
6 0
2 years ago
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DENIUS [597]

Y=mx+b   change the equation to solve for m instead. first subtract b on both sides

y-b=mx  then divide both sides by x

(y-b)/x=m

m=(y-b)/x

7 0
2 years ago
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Answer:

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