Time is C. 50 seconds
Step-by-step explanation:
The population of bacteria at time t here is given by

where
b is the number of bacteria
t is the time in seconds
Here we want to find the approximate time at which the number of bacteria is 
b = 625
Substituting into the equation and solving for t, we find:

Therefore, the solution is
C. 50 seconds
Learn more about population growth:
brainly.com/question/10689103
#LearnwithBrainly
 
        
             
        
        
        
[Given]
{ x + y = 6
{ x = y + 4
[Plug-in our x value & solve]
[Given] x + y = 6
[ Plug-in] (y + 4) + y = 6
[Distribute] y + 4 + y = 6
[Combine like terms] 2y + 4 = 6
[Subtract 4 from both sides] 2y = 2
[Divide both sides by 2] y = 1
[Answer]
Third option - (5, 1)
-> You do not need to solve for x since this is the only option that has y = 1, but to solve for x we would do y + 4 = 1 + 4 = 5, so this answer fully checks correctly
Have a nice day!
      I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
      ★ Also please leave the rating you think I deserve (It helps other users as well as myself)
- Heather
 
        
             
        
        
        
-10m - 6m -8 -6m = −22m −8
 
        
             
        
        
        
Answer:  1.3125 gallons
Step-by-step explanation: The machine pumps 2.1 gallons of water every 1.6 minutes. 1.6 minutes is 1.6x more than 1 minute. So, we have to divide 1.6 by 1.6. Next, we have to divide 2.1 by 1.6. We can make this a bit easier by multiplying both of them by 10 to get 21/16 which is 1.3125.