Answer:  A) 1260
Step-by-step explanation:
We know that the number of combinations of n things taking r at a time is given by :-

Given : Total multiple-choice questions  = 9
Total open-ended problems=6
If an examine must answer 6 of the multiple-choice questions and 4 of the open-ended problems , 
No. of ways to answer 6 multiple-choice questions
 = 
No. of ways to answer 4 open-ended problems
 = 
Then by using the Fundamental principal of counting the number of ways can the questions and problems be chosen = No. of ways to answer 6 multiple-choice questions x No. of ways to answer 4 open-ended problems
= 
Hence, the correct answer is option A) 1260
 
        
             
        
        
        
Answer:
Given 6.8(6.7 – 7.2) – 2(4.6 + 1.2) 
Explanation:
-15 is your answer
 
        
                    
             
        
        
        
Given:
Radius of the cone = 3 inches
Height of the cone = 8 inches
To find:
The volume of the cone, in terms of  π.
Solution:
We know that, the volume of a cone is:

Putting  , we get
, we get




Therefore, the volume of the cone is  .
.
 
        
             
        
        
        
Answer:
63°
Step-by-step explanation:
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hope it helps...
have a great day!!