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Dafna1 [17]
2 years ago
6

If h(x) = x2-5x + 7 find: h(-5)

Mathematics
2 answers:
NISA [10]2 years ago
7 0
It is −3)=57. Explanation: Hence h(x)=5x2−4x then just replace x for −3. h(−3)=5⋅(−3)2−4⋅(−3)⇒h(−3)=45+12⇒h(−3)=57
Lady_Fox [76]2 years ago
5 0

Answer:

h(-5)=22

Step-by-step explanation:

Replace x with -5.

h(-5) = (-5)2-5(-5) + 7

Simplify.

h(-5)=-10+25+7

Simplify.

h(-5)=22

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A newspaper article reports the results of an election between two candidates. The article says that Smith received 60% of the v
dangina [55]

Step-by-step explanation:

Since, smith receives 60% of the vote this means murphy must receive 40% of the vote. Therefore 15 = 40% of the total vote.

Thus total vote = 37.5, which is kind of absurd. As total vote count must be an integer. Moreover, the report must be consistent with the result, which does not seem in this case.

4 0
2 years ago
???????????????????????????
Alina [70]

Answer:

Mean=13.22

Median=13.05

Standar deviation=3.51

  • The mean is  a measure of central tendency in a probabilistic sense. Matematically speaking,  it can be calculated as the average of the elements that conform a set of numbers. It is important because it provides you with information about a dataset without having to know every value of your data. As an example, if you have a sample of the age of school teachers, the mean age of teachers will tell you what is the average age among all the teachers in the sample.It can be calculated like this:  \frac{1}{n} \times \sum x = \frac{1}{n} \times (12+12.5+18.2+13.6+15.3+7.7) = 13.22
  • The median value results from ordering the dataset in an ascending way, from the smallest to  the greatest, and then determining which value divides the sample ordered in this way, in half.  It is an other measure of central tendency and it helps you to know about the balance of your data. In the example provided before, if the median age of teachers is 45,  you know that half of teachers are older than 45, and the other half is younger. When dealing with a finite set of numbers, the median’s value will depend on the characteristic of the sample. If there is an odd number of observations, the median value will be the middle value. On the other hand, if there is an even number of observations, the median will be the average between the two middle values. In the exercise, this value is calculated as the average between 12.5 and 13.6, which results in 13.05.
  • Standar deviation is a measure of dispersion around the mean value. Its value is an indicator of how near are the observations in the sample, from the mean.  A low standard deviation imply that the observations in your dataset are closed to the mean value. In terms of the teachers’ example, if the mean is 50 and the standard deviation is 2, many of the teachers in your datasets are between 48-52 years old. Following this example, if the standard deviation was 10 and the mean 50, most of the teachers would be between 40 and 60 years old (mean plus and less 10 years). The lowest the standard deviation, the more informative the mean: when the standard deviation is small, the values of the sample are closer to the mean. To obtain the standar deviation value one should use the following equation: s=\sqrt{\frac{1}{n-1} \times \sum{ (x_{i} - \bar{x})^{2} } \\, where \bar{x} is the mean value that you calculated before, and "n" is the number of observations in the sample.

3 0
3 years ago
PLEASE HELP!! 20 POINTS!!
luda_lava [24]

Answer:

yea

Step-by-step explanation:

8 0
2 years ago
You have a new pool and want to know it's volume. The pool is 5 feet deep and has a radius of 7 feet. About how much water can t
MrRa [10]

Answer:

769 cubic ft

Step-by-step explanation:

Its volume:

Find the volume of a cylinder of radius 7 ft and length 5 ft:

The basic formula for his volume is V = πr²h.  In this case, the volume is:

V = 3.14(7 ft)²(5 ft) = 769 cubic feet of water.

3 0
3 years ago
Solve the system of linear equations. <br> −8x+5y=26<br> 9x−3y=−3
Sloan [31]

Answer: x = 3 and y = 10

Step-by-step explanation:

-8x + 5y = 26     .................. equation 1

9x - 3y = -3          ................ equation 2

Solving the system of linear equations by elimination method.

The means we have to make the coefficient of one of the variable the same in order to eliminate the variable first.

Let us eliminate the variable y first , this means we will multiply equation 1 by 3 and multiply equation 2 by 5. Doing this , we have

-24x + 15y = 78      ............. equation 3

45x - 15y = -15     ................ equation 4

Now that we have the same coefficient , we have to check their signs , if the have the same signs , we will subtract , that is , if both are having positive signs , we will subtract , if both have negative signs , we will also subtract but if their signs differ we will add. Following this rule and considering the equations above , the coefficients of y have different signs , so we will add equation 3 and equation 4 , so we have:

21x = 63

x = 63/21

x = 3

Substitute x = 3 into equation 1 or equation 2 to get the value of y , using equation 2 , we have

9x - 3y = -3

9(3) - 3y = -3

27 - 3y = -3

27+3 = 3y

30 = 3y

30/3 = y

Therefore y = 10

Therefore : x = 3 and y = 10

8 0
3 years ago
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