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frutty [35]
3 years ago
12

Twenty less than a number is more than twice the same number . Step by step to get the answer

Mathematics
2 answers:
Vika [28.1K]3 years ago
5 0
N=number 
N - 20 > 2N   
-20 > N 


Step 1: Set up an inequality based on the words. twenty less means minus twenty or - 20. I used N for the unknown number. twenty less than a number, means N -20.  Is more than means its greater so N - 20 > than the twice the same number which is 2N. so N-20>2N is my inequality 

Step 2: subtract N from both sides and you are left with -20 > N.  which means that N has to be less than -20. So, -21, -22, -23.... would all work.   
likoan [24]3 years ago
3 0
20 less than (-20) a number (n) is more than (>) twice the same number (2n)
-20+n>2n
minus n both sides
-20>n
n<-20
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3 years ago
An art history professor assigns letter grades on a test according to the following scheme. A: Top 13% of scores B: Scores below
madam [21]

Answer:

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Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

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Scores on the test are normally distributed with a mean of 79.7 and a standard deviation of 8.4.

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So between the 56th percentile and the 100 - 13 = 87th percentile.

56th percentile:

X when Z has a p-value of 0.56, so X when Z = 0.15. Then

Z = \frac{X - \mu}{\sigma}

0.15 = \frac{X - 79.7}{8.4}

X - 79.7 = 0.15*8.4

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87th percentile:

X when Z has a p-value of 0.87, so X when Z = 1.13.

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1.13 = \frac{X - 79.7}{8.4}

X - 79.7 = 1.13*8.4

X = 89

The numerical limits for a B grade are 81 and 89, that is, a score between 81 and 89 gets a B grade.

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3 years ago
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8 0
3 years ago
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sesenic [268]
Ok so the average is 50

average of x number of things is
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minus 133 both sides
x=67

a score of 67 is needed
5 0
3 years ago
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