In 6.4 days the size of the population will be tripled.
Let the equation be
Given that the population doubles every 4 days.
It means, A becomes 2P in 4 days.
Now, we have to find time t, when A becomes 3P.
Therefore, in 6.4 days the size of the population will be tripled.
fa tha first one you gonna add y to both sides
it look like this
therefore your answer is
fa tha second one
you gonna flip tha equation
it gonna look like x-4y=y
then add 4 to both sides
it gonna look like tha
x-4 +4 =y +4
so therefore tha answer is x=y+4