19539 bacteria will be present after 18 hours
<u>Solution:</u>
Initial value of bacteria N = 6000
Value after 4 hours
= 7800
<em><u>The standard exponential equation is given as:</u></em>

where
N is amount after time t
No is the initial amount
k is the constant rate of growth
t is time
Plugging in the values in formula we get,

Solving for "k" we get,

Taking "ln" on both sides, we get


On solving for ln, we get k = -0.0656
The equation becomes, 
Now put "t" = 18,

Hence the bacteria present after 18 hours is 19539
Answer:
it would take him 15 weeks
Step-by-step explanation:
cost of shoes= 95
he has 20 so 95-20= 75
he needs 75 more dollars so 75 divided by 5= 15 weeks
If you divide both sides of your inequality by five, you see that k must be less than 9
k < 9 that is equivalent.
You can make another equivalent inequality by multiplying both sides by 3.
3k < 27
I think it is the first one even though none of them make since to me