Answer:
t=5.18 minute
Step-by-step explanation:
Using Newton's law of cooling
T is temperature of a cup of coffee at any time t 
, is the temperature of the surrounding and k is a constant of proportionality in this negative because temperature is decreasing.
To find constant knowing the time and the temperature the first step of the change of energy in cup of coffee
Now using the constant of decreasing can find the time to be a 145 temperature the cup of coffee
The 50 is the error because cents are represented with decimals so it has to be .50
Answer:
The American population was 20% of the British population.
Step-by-step explanation:
Let us call 
the american population, 
the British population before the migration, and 
the population that migrated from America to Britannia.
Now, the population that migrated was 20% of the american population:
,
and the same population increase the British population by 4%:
Combining equation (1) and (2) we get:
Thus, the American population was 20% of the British population.
Answer:
Step-by-step explanation:
RHS means on the right hand side
And LHS means on the left hand side
So if x is one the right side of the expression ,it is on the RHS and if it is on the left side of the expression , it is on the LHS
