Answer:
Step-by-step explanation:
Step-by-step answer:
Answer to problems of this kind is the reciprocal of the harmonic mean of the time required.
We need to find the average of the speeds, not the average of the time.
The respective speeds are 1/3 and 1/4.
The average of the speeds is therefore (1/3+1/4)/2 = 7/24 (harmonic mean of the time taken).
The time required is therefore the reciprocal of the unit speed,
T = 1/(7/24) = 24/7 = 3 3/7 minutes, or approximately 3.43 minutes.
There will be 45,600 bacteria present after 19 hours
Answer:
Step-by-step explanation:
divide the number then add on
Answer:
D)
Step-by-step explanation:
The last graph best represents the function.
