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Elenna [48]
3 years ago
11

Pls Answer this Right and Professionally I’m begging you I will mark a brainless too

Mathematics
2 answers:
Molodets [167]3 years ago
8 0

Answer:

3. x=110  y=110  t=70

4. a=105  b=105  c=75  d=75  e=105  g=75  f=75

Step-by-step explanation:

aliya0001 [1]3 years ago
8 0
X=110,Y=110,T=70
Should be the answer to the 1st question. 110+70=180
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HOW TO DO THIS QUESTION ​
sdas [7]

Answer:

A ≈ 40.3 cm²

Step-by-step explanation:

The area of right Δ ACD is calculated as

A = \frac{1}{2} bh ( b is the base and h the perpendicular height )

Here A = 50.5, b = CD and h = AC , then

\frac{1}{2} × 14 × AC = 50.5

7 AC = 50.5 ( divide both sides by 7 )

AC ≈ 7.214

The area of Δ ABC is calculated as

A = \frac{1}{2} × BC × AC × sin36°

  = 0.5 × 19 × 7.214 × sin36°

  ≈ 40.3 cm² ( to 3 sf )

3 0
2 years ago
Read 2 more answers
Scores on a final exam taken by 1200 students have a bell shaped distribution with mean=72 and standard deviation=9
SVETLANKA909090 [29]

Answer:

a. 72

b. 816

c. 570

d. 30

Step-by-step explanation:

Given the graph is a bell - shaped curve. So, we understand that this is a normal distribution and that the bell - shaped curve is a symmetric curve.

Please refer the figure for a better understanding.

a. In a normal distribution, Mean = Median = Mode

Therefore, Median = Mean = 72

b. We have to know that 68% of the values are within the first standard deviation of the mean.

i.e., 68% values are between Mean $ \pm $ Standard Deviation (SD).

Scores between 63 and 81 :

Note that 72 - 9 = 63 and

72 + 9 = 81

This implies scores between 63 and 81 constitute 68% of the values, 34% each, since the curve is symmetric.

Now, Scores between 63 and 81 = $ \frac{68}{100} \times 1200 $

= 68 X 12 = 816.

That means 816 students have scored between 63 and 81.

c. We have to know that 95% of the values lie between second Standard Deviation of the mean.

i.e., 95% values are between Mean $ \pm $ 2(SD).

Note that 90 = 72 + 2(9) = 72 + 18

Also, 54 = 63 - 18.

Scores between 54 and 90 totally constitute 95% of the values. So, Scores between 72 and 90 should amount to $ \frac{95}{2} \% $ of the values.

Therefore, Scores between 72 and 90 = $ \frac{95}{2(100)} \times 1200 = \frac{95}{200} \times 1200  $

$ \implies 95 \times 12 $ = 570.

That is a total of 570 students scored between 72 and 90.

d. We have to know that 5 % of the values lie on the thirst standard Deviation of the mean.

In this case, 5 % of the values lie between below 54 and above 90.

Since, we are asked to find scores below 54. It should be 2.5% of the values.

So, Scores below 54 = $ \frac{2.5}{100} \times 1200 $

= 2.5 X 12 = 30.

That is, 30 students have scored below 54.

8 0
2 years ago
During the 2005 football season Team Tackle beat Team Sack by 18 points their combined scores totaled 66. the individual team sc
igomit [66]
1. 40 points 2. 21 points
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3 years ago
What can you tell about the mean of each
Lilit [14]

Answer: The difference between the mean cost to treat dogs at A New Leash on Life

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Clinic is about 10 times the MAD This is a large difference.

Step-by-step explanation:

I GOT THIS RIGHT! THIS IS THE ANSWER

3 0
3 years ago
One way to build a staircase is to attach triangular blocks to an angled support, as shown above. If the support makes a 32 angl
Ivan
All the angels ect would have to be equal to all of them dose it tell u the angels

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