this shows fees (f) for an aerobics for different numbers of months which equation models the relationship

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i