1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Jlenok [28]
3 years ago
13

Help please .........

Mathematics
1 answer:
sdas [7]3 years ago
8 0
\frac{5x-20}{2} = 30

Thus x = 16
You might be interested in
Suppose on a certain test, fifty students earn a perfect score and fifty students earn a zero. determine the mean grade and stan
kodGreya [7K]

Answer:

Mean=50.

standard deviation=50.

Step-by-step explanation:

Let the perfect score be 100.

The mean(average) of a data is given by: Mean=\frac{sum of data points}{number of data points}

Here the number of data points are 100. out of which 50 attains a value 100,and 50 attains value 0.

so, sum of data points=50×100+50×0=5000.

Mean=\frac{5000}{100}

Mean=50.

"Now the standard deviation of data points are calculated by firstly subtracting mean from every entry and then square the number and take it as new entry and calculate the mean of the new data entry and lastly taking the square root of this new mean".

Here if 50 is subtracted from each entry the new entry will have 50 entries as '50' and 50 entries as '-50'.

next on squaring we will have all the 100 entries as '2500'.

now the mean of these entries is: \frac{2500\times100}{100}

                                                         =2500

taking it's squareroot we have \sqrt{2500}=50

Hence, standard deviation=50.




5 0
3 years ago
Read 2 more answers
How do you solve 45 = 3 (x + 1) using the distributive property?
Damm [24]

Answer:

x=14

Step-by-step explanation:

45 = 3 (x + 1)

Distribute the 3 to both terms in the parentheses

45 = 3x +3

Subtract 3 from each side

45-3 = 3x+3-3

42 = 3x

Divide each side by 3

42/3 = 3x/3

14 =x

8 0
3 years ago
18% of 350 students
Drupady [299]
X       18
350   100

6300/100=63
3 0
3 years ago
Read 2 more answers
6. A two-story building measures 21 feet from
Andru [333]

Answer:

12 inches

Step-by-step explanation:

To solve you have to set up a ratio. Because both buildings are being shrunk the exact same amount, you just have to account for the size difference from the miniature and real life. The ratio is 21:3 and 84:x. To find x you just have to cross multiply and solve.

The equation comes out to be 252 = 21x

Divide both sides by 21 to get x.

252/21 = 12

The size of the 84 foot building as a model is 12 inches.

3 0
2 years ago
Help please in 14,15,16,17,18,19,20,21
Savatey [412]
14. [-27, 0, 1.728, 125]
15. [ 18, 15, 13.8, 10]
16. [-3.9, 0, 1.56, 6.5]
17. [9, 0, 1.44, 25]
18. [12, 0, -4.8, -20]
19. [10, 1, 2.44, 26]
20. [64, 25, 14.44. 0]
21. [-22, -4, 3.2, 26]
7 0
3 years ago
Other questions:
  • Which rule describes the composition of transformations that maps JKL to J”K”L”
    9·2 answers
  • You asked amusement park visitors the question "How many times did you ride a roller coaster today?" as they left the park. The
    10·2 answers
  • What is the area of a square when the side length is 2/3cm
    15·1 answer
  • 2 POS
    7·1 answer
  • What is the area of the figure
    15·2 answers
  • WILL MARK BRAINLIST!!!!
    12·1 answer
  • Determine if the sequence is geometric. If it is, find the common ratio. ( -4, 12, -36, 108, ... )
    9·1 answer
  • How can you delete your answer you submitted to a question??
    13·2 answers
  • Identify the slope and the y-intercept of 3x-4y=-16​
    8·2 answers
  • Please help I’m stuck
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!