The maximum number of nights he could stay is 4 nights
Lemme give you a cheap answer, by simply using the "compound interest formula", which is what that is, 2% compounded yearly
thus

plug in those values, and simplify
The profit that is gained from the production and selling of the jeans is given to be calculated through the the equation,
P = 20x - 50
For 75 jeans, we just have to substitute 75 to the x's of the equation. This then becomes,
P = 20(75) - 50 = 1450
Thus, the company will make a profit of $1450 by production of 75 jeans.
That equation is the same as 3m=0, only m=0 works. Do you think they want you to say, all numbers but zero are excluded? Or is the equation different?
The answer is 3 your welcome