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ki77a [65]
3 years ago
6

I think I know the answer but just in case can someone help me ? And give me an explanation

Mathematics
1 answer:
RideAnS [48]3 years ago
5 0
You multiply both sides by 9 first so you have -45=y-7. then add 7 to both sides to get y=-38
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Evaluate the expression 72/x2-2 for x=3
Rzqust [24]

Answer:46

Step-by-step explanation:

7 0
3 years ago
Write 2.75 as a mixed number and as an improper fraction. Write your answers in simplest form.
xxMikexx [17]
Mixed number: 2 3/4
improper fraction: 11/4
8 0
3 years ago
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In a data set, Q1 is 24, and Q3 is 36. Regarding the same data, use the "IQR x 1.5" method to determine which of the following n
STatiana [176]

Answer:

The answer is none triangle

Step-by-step explanation:

we know that

The sum of internal angles of a triangle must be equal to  

In this problem we have three angles, each measuring  

so

The total sum of the three angles is equal to  

therefore

The answer is none triangle

6 0
3 years ago
A test is used to assess readiness for college. In a recent​ year, the mean test score was 20.3 and the standard deviation was 4
Vlada [557]

Answer:

\mu = 20.3

\sigma = 4.9

And we can find the limits in order to consider values as significantly low and high like this:

Low\leq \mu -2 \sigma= 20.3- 2*4.9 = 10.5

High\geq \mu +2 \sigma= 20.3+ 2*4.9 = 30.1

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

For this case we can consider a value to be significantly low if we have that the z  score is lower or equal to - 2 and we can consider a value to be significantly high if its z score is  higher tor equal to 2.

For this case we have the mean and the deviation given:

\mu = 20.3

\sigma = 4.9

And we can find the limits in order to consider values as significantly low and high like this:

Low \leq \mu -2 \sigma= 20.3- 2*4.9 = 10.5

High\geq \mu +2 \sigma= 20.3+ 2*4.9 = 30.1

6 0
3 years ago
Define contrapositive p --> q=?
siniylev [52]

Answer:

~q→~p

Step-by-step explanation:

The contrapositive of a statement is formed by negating the hypothesis and conclusion of a statement and switching them (the hypothesis becomes the conclusion and vice versa).

With this definition we can conclude that the contrapositive of p→q would be ~q→~p

3 0
3 years ago
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