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wlad13 [49]
3 years ago
12

Solve the system of equations below by elimination. -2x-4y=-4 -x+7y=-20

Mathematics
1 answer:
Alik [6]3 years ago
5 0

Answer:

67

Step-by-step explanation:

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An ant can travel at a constant speed of 980 inches every 5 minutes. At this rate, how far can the ant travel in 7 minutes? *
Luda [366]
Answer: 1,372
Reasoning:
980 divided by 5 = 196
196 times 7 = 1,372
5 0
3 years ago
The table show the age in years of employees in a company
adelina 88 [10]

Answer:

A. 24 ≤ a < 26.

B. 22.5

Step-by-step explanation:

A. Determination of the modal class interval.

Mode is the class with the highest frequency.

From the table given above, the highest frequency is 8, therefore the class will the highest frequency is:

24 ≤ a < 26.

B. To obtain the mean, we must determine the class mark. This is illustrated below:

Class >>>>> class mark >>> frequency

18 – 19 >>>> 18.5 >>>>>>>>> 3

20 – 21 >>> 20.5 >>>>>>>> 2

22 – 23 >>> 22.5 >>>>>>>> 7

24 – 25 >>> 24.5 >>>>>>>> 8

26 >>>>>>>> 26 >>>>>>>>> 0

The mean is given by the summation of the product of the class mark and frequency divided by the total frequency. This is illustrated below:

Mean = [(18.5x3) + (20.5x2) + (22.5x7) + (24.5x8) + (26x0)] / (3+2+7+8+0)

Mean = (55.5 + 41 + 157.5 + 196 + 0)/20

Mean = 450/20

Mean = 22.5

Therefore, the mean age is 22.5

4 0
3 years ago
Read 2 more answers
The medical director of a company looks at the medical records of all 50 employees and finds that the mean systolic blood pressu
Alekssandra [29.7K]

Considering that the value of 126.07 is valid for the population, it is a parameter.

<h3>What is the difference between a statistic and a parameter?</h3>

  • If the measure is defined only for the sample, it is a statistic.
  • If the measure can be defined for the population, it is a parameter.

In this problem, the mean blood pressure is calculated for all employees, which means that it is valid for the population, hence it is a parameter.

More can be learned about parameters and statistics at brainly.com/question/13794992

#SPJ1

8 0
2 years ago
Interest expense would be classified on a multiple-step income statement under the heading a) Other revenues and gains. b) Opera
DiKsa [7]

Answer:

Answer is c

Step-by-step explanation:

Interest expense has no relation with the companies' principal activities. Therefore, on a multiple-step income statement, besides the other expenses like lawsuit settlements, extraordinary losses from investments etc., interest expense is listed in the non-operating and other section.

5 0
3 years ago
Help!<br><br> What is the area of the figure Brianna created in square feet?
elixir [45]

Answer:

24 3/4

Step-by-step explanation:

multiply 4 1/2 times 1/2 to get your answer..

3 0
3 years ago
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