Answer:
A culture started with 5000 bacteria. after 4 hours, it grew to 6000.
=> Increasing rate = difference/time = (6000 - 5000)/4 = 250 bacteria/hour
=> The number of bacteria after 17 hours:
N = 5000 + 250 x 17 = 9250 bacteria
Hope this helps!
:)
 
        
                    
             
        
        
        
Answer:
y = 
Step-by-step explanation:
The function will be cubic.  The x-intercepts are -4, -1, and 2
The constant factor is -1 because the graph falls on the right.  So, 
y = -(x + 4)(x + 1)(x - 2)
y = -
 
        
             
        
        
        
The student will have $135 in her bank account at the end of the ninth week. You can fine this out by finding out the amount she deposits a week and to do this you would take the $30 and divide it by 2 because she had $30 at the end of the second week. 
30/2=15
So you see that the student deposits $15 each week, so to find out how much money she will have in 9 weeks you will multiply her $15 by 9.
15x9=135
So the student will have $135 at the end of the ninth week.