Answer:
the answer will be 50 I think
 
        
             
        
        
        
Part A: 
From the graph, it seems that the lines intersect at (3,-1)... This seems to be the solution... 
Part B: 
g(x) is a negative line, and the slope is 2 (from rise/run). Y int. = 5. So, the equation is -2x+5. Plug in some numbers for this; say 1 and 2. The coordinates would be (1,3) and (2,1). 
Part C: 
The 2 graphs seem to intersect at (0,5), so this is the solution... 
ALL of this is based on only looking at the graph, which is no better than drawing lines on the sand.. For example, the y intercept for g(x) could be 4.9 or 5.1, and I don't know the equation for f(x)... Based on the info I have,  gave my best answers.. 
Hope this helps.. 
        
             
        
        
        
Answer:
 <em>45 </em>
Step-by-step explanation:
PQ = 45 units 
 
        
             
        
        
        
First  calculate that numeric value. It cannot be done immediately without calculations.
if 85% of studends liked mystery that means that 100% - 85% = 15% didnt like.
Those 15% are 30 that were given in text. Now we can calculate this using proportion:
15%        30 students
85%         x students
we use cross multiplication:
15*x = 30*85
x = 30*85/15
x = 170
Answer is 170