Set up a proportion: 25/100 = 50/n where n = # of teens surveyed
Simplify fraction: 1/4 = 50/n
Cross multiply: n = 200
So 200 teens were surveyed.
        
             
        
        
        
The line would intersect with the y-axis at (0,0)
        
             
        
        
        
Answer:
x = -1 and x = 4
Step-by-step explanation:
Step 1:  Get everything to one side of the equation so it's set equal to zero..
-x² + 4x = x - 4  becomes...
   -x² + 3x + 4 = 0        (subtract x and add 4 to both sides)
     x² - 3x - 4 = 0  (divide both sides by -1, we want the x² term to be positive)
    (x - 4)(x + 1) = 0          (factor)
       so 
x - 4 = 0,    then x = 4
and 
x + 1 = 0,   then x = -1   
 
        
             
        
        
        
Answer:
answer 
Step-by-step explanation:
h+2 ≥ 10 
h ≥ 10 - 2 
h ≥ 8