Is y=-10x non-proportional with a postive y-intercept

In exponential growth functions, the base of the exponent must be greater than 1,how would the function change if the base of the exponent were 1? how would the fiction change if the base of the exponent were between 0and 1

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.