Question

The function f has the property that f(x)=f(x+1) for all numbers x. If f(4)=17, what is the value of f(8)?

Answer 1

If the condition holds true, then:
f(4) = f(5)
f(5) = f(6)
f(6) = f(7)
f(7) = f(8)

Thus,
f(4) = f(8)

f(8) = 17