Answer:
1 and 3
Step-by-step explanation:
Part a: 1 and 3
part b: x = −22
<u><em>Please mark as brainliest </em></u>
Have a great day, be safe and healthy  
Thank u  
XD
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
The common difference (d) can be found using the first and 4th terms:
   a1 = 3
   a4 = a1 +d(4 -1)
   -9 = 3 +3d . . . . . simplify
   -3 = 1 + d . . . . . . divide by 3
   -4 = d . . . . . . . . . subtract 1
Then ...
   x = a1 + d = 3 -4 = -1
   y = x + d = -1 -4 = -5
The values of x and y are -1 and -5, respectively.
 
        
             
        
        
        
Answer:
sometimes, if their average angle is over 45 degrees
never are 2 obtuse angles summing to 180 degrees
always.  two 90 degree angles always sum to 180 which is a straight line
 
        
             
        
        
        
Seven and seven thousandths.
        
                    
             
        
        
        
This is for the first page
Answer: answer to question 17 is r=32/7, answer to question 18 is m=-12, answer to question 19 is k=-9, answer to question 20 is p= No solution, answer to question 21 is x= infinite solutions, answer to question 22 is x= -4. 
Step-by-step explanation:
This picture is for the second page