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
Agata [3.3K]
3 years ago
13

PLEASE HELP !!!!!!!!!!

Mathematics
1 answer:
Volgvan3 years ago
3 0

Answer:

C.13

Step-by-step explanation:

D is a midpoint, which means that AD=DB= 1/2 AB = 1/2 (24) = 12

Using Pythagorean theorem we know that CD^2+DB^2=CB^2

That means that 5^2+12^2=CB^2

      25+144=169

169=13^2

CB=13

a=CB=13

You might be interested in
Look at the figure. If m∠J = 55, find m∠JKM.<br><br><br><br> 55<br><br> 90<br><br> 35<br><br> 70
viva [34]

35

Step-by-step explanation:

x+55 + 90=180

x= 180-145

x=35

6 0
3 years ago
On average, a student’s grade decreases 2 points for every 30 minutes they spend playing Fortnite. what is the y intercept , slo
aliina [53]

Answer:

y intercept is 0,0 Slope is 15 equation is y=15x

6 0
3 years ago
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
3 years ago
M + 6 = 3m + 14<br> Solve?
labwork [276]

Answer:

-6=m

Step-by-step explanation:

m+6=3m+14

-m       -m

6=2m+14

-14      -14

-12=2m

-12/2=-6

5 0
3 years ago
Read 2 more answers
If, in a right triangle, θ = 16 and hypotenuse has length 4, how long is the side adjacent to θ? Round to at least 3 decimal pla
Marysya12 [62]

Answer:

I don't know this but try to do ot

4 0
2 years ago
Other questions:
  • Kevin’s bill at a restaurant was $26.51. He left a 15% tip. About how much tip did Kevin leave?
    14·1 answer
  • if a salesman has a base salary of 35,000 per year makes 5% commission on each sales ,how much must he do in sales to make a tot
    6·1 answer
  • Larissa invested $19,000 in an eleven-year CD giving 7.5% interest, but needed to withdraw $2,500 after four years. If the CD’s
    5·2 answers
  • Prove the sum of two rational numbers is rational where a, b, c, and d are integers and b and d cannot be zero. Steps Reasons 1.
    14·2 answers
  • What is the nth term of the geometric sequence 4, 8, 16, 32, ... ?
    9·1 answer
  • Do y’all know what this one is I’m kinda struggling
    9·2 answers
  • If f(x) = 3x2 - 4 and g(x) = x+2, find (f - g)(x).
    6·2 answers
  • X-2y = 10<br> x + 3y = 5<br> Using elimination method
    9·1 answer
  • A 27- inch long ribbon was cut into 4 equal lengths. How long was each piece of ribbon?
    5·1 answer
  • Pls help ill give brainliest<br><br> a=<br> x=
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!