By applying basic property of  Geometric progression we can say that sum of 15 terms of a sequence whose first three terms are 5, -10 and 2 is                     
  
<h3>What is
 sequence ?</h3>
Sequence is collection of  numbers with some pattern .
Given sequence 

We can see that 

and 

Hence we can say that given sequence is  Geometric progression whose first term is 5 and common ratio is -2
Now  term of  this Geometric progression can be written as
  term of  this Geometric progression can be written as 

So summation of 15 terms can be written as

By applying basic property of  Geometric progression we can say that sum of 15 terms of a sequence whose first three terms are 5, -10 and 2 is                     
  
To learn more about  Geometric progression visit : brainly.com/question/14320920
 
        
             
        
        
        
Answer:
m = 7.1
Step-by-step explanation:
3 (m -5) + 8 = 7 -1/2 (4m - 11)
So, what I did first was distribute the values in the parenthesis to get,
3m - 15 + 8 = 7 -2m -5.5
Now that we have the parenthesis taken care of we can do the simpler math,
 3m - 23 = 7 -2m - 5.5
I just added the 15 and 8, so now I move the -5.5 to the opposite side by adding.
3m - 23 = 7 -2m -5.5
<u>        +5.5             +5.5</u>
3m - 28.5 = 7 - 2m
Here we can do the same with the -2m.
3m - 28.5 = 7 - 2m
<u>+2m                 +2m</u>
5m - 28.5 = 7
To get rid of the -28.5 I added it to the 7 getting an answer of,
5m - 28.5 = 7
<u>      + 28.5    +28.5</u>
5m = 35.5
Finally, divide 5m and 35.5 both by 5.
5m/5 = m
 35.5/5 = 7.1
 Answer: m=7.1
Sorry it's really long, but I hope this helps! Have a great day!
 
        
             
        
        
        
The correct answer to this question is 240
From the image i've seen, the RDC has an angle of 120. So the major arc DC (that passes A and B) has an angle of 240.
So this makes that the measure of the angle of DAC is 240 because of the angle formed by RDC which is 120.