Answer:
a) 8 b)9 c)1 d) 3 
Step-by-step explanation:
 
        
             
        
        
        
we know that
<u>Vertical angles</u> are a pair of opposite and congruent angles formed by intersecting lines.
so
Let
x1---------> angle vertical 1
x2---------> angle vertical 2
x1=x2 ------> equation 1
in this problem
if the vertical angles formed are supplementary
that means that
x1+x2=180 ------> equation 2
substitute equation 1 in equation 2
x1+x1=180
2x1=180
x1=180/2
x1=90 degrees
therefore
<u>the answer is</u>
The vertical angles are right angles
 
        
             
        
        
        
Answer:

Step-by-step explanation:
we know that
The equation of a exponential growth is equal to

where
a is the initial value  
r is the rate of growth
x is the time in hours
y is the value of the quantity
we have

substitute


For x=22 hours
substitute

 
        
             
        
        
        
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Answer:
C
Step-by-step explanation:
