Answer:

Step-by-step explanation:
 
        
             
        
        
        
Answer:
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Step-by-step explanation:
 
        
             
        
        
        
Using the definition of vertical angles, the value of z is: 15.
<h3>Vertical Angles Pair</h3>
The two pairs of opposite angles formed when two straight lines intersect are called vertical angles, and are therefore congruent to each other.
Thus:
2z + 10 = 40
2z = 40 - 10
2z = 30
z = 30/2
z = 15
Therefore, using the definition of vertical angles, the value of z is: 15.
Learn more about vertical angles on:
brainly.com/question/1673457
 
        
                    
             
        
        
        
Answer:
 total surface area of cone is πr (r+l)
 22/7 x 3 (3+4)
22/7*3 (7) 
22 x 3 ( as 7 that was divided by 22 was cut out with 7 in the bracket) 
hence,
TSA of cone = 66pi
 
        
             
        
        
        
-3 1/2
just add the fractions
Mark brainliest please