(if the last five is an exponent, here is the answer)
5 • 10^5
first work on the exponent
5 • 100,000
multiply
500,000
He drinks 8 glasses of water in one day. to know the number of glasses he drinks in 365 days, simply use cross multiplication as follows:
number of glasses per year = (365*8)/1 = 2920 glasses
so, yes his assumption is reasonable if he kept the same rate (8 glasses per day each day)
Answer:
N = 400(1.25^t); 3725
Step-by-step explanation:
25% more is 125% of the previous, which is 1.25
N = 400(1.25^t)
t = 10
N = 100(1.25^10)
N = 3725.290298
Around 3725 people

The account will have decreased by $2640 after 2/3 year.
6, 7, 8, and 9. just plug the X into the equation