Answer: a) 800
b)
Step-by-step explanation:
The exponential growth function is represented by :-
, where A is initial value , b is the multiplicative rate of change and t is the time period.
Given : A bacteria culture starts with 100 bacteria and doubles in size every half hour.
i.e. A = 100 and b=2
Then, the exponential growth function to find the number of bacteris after t hours :_
At x=3
Hence, the there are 800 bacteria after 3 hours.
5.
-4=r/20-5
First add 5 to both sides
1=r/20
Then multiply both sides by 20
20=r
Final answer: r=20
7.
(v+9)/3=8
First multiply both sides by 3
v+9= 24
Subtract 9 from both sides
v=15
Final answer: v=15
The answer would be 100/250, but simplified it would be 2/5. Jus divide both numbers by a common factor, in this case, 50.
Hopefully this helps!
Well, since it asks for an estimation, let's make a rough guess.
Let's round 24% to 25%.
25% is 1/4 of 60.
60 divided by 4 equals to 15.
Estimate will be 15.