The answer is a) 1500 because when you divide 675 (the given number of students that cheated on 1 to 7 courses) by 1500 you get .45 or 45%.
        
             
        
        
        
The answer is (x,y) = (-2, 16) 
do you need an explanation as well?
        
             
        
        
        
Answer:
-5/2
Step-by-step explanation:
7=intersect of y 
-5/2=Slope
 
        
             
        
        
        
Answer:
3)  x = 15; 95 and 85      4)  x = 12; 98 for both angles
Step-by-step explanation:
2x + 65 + 3x + 40 = 180       Set the equations equal to 180 
5x + 105 = 180                      Combine like terms
      - 105  - 105                      Subtract 105 from both sides
5x = 75                                  Divide both sides by 5
x = 15
Plug 15 into both equations
2(15) + 65 = 95
3(15) + 40 = 85 
4)  5x + 38 = 9x - 10             Set the equations equal to each other
   - 5x          - 5x                    Subtract 5x from both sides
  38 = 4x - 10
 + 10       + 10                         Add 10 to both sides
48 = 4x                                  Divide both sides by 4
12 = x
Plug 12 into both equations
5(12) + 38 = 98
9(12) - 10 = 98