Which relation is a function?

Asilkworm winds its cocoon out of one long silk fiber. to make silk thread, 3 to 10 of these silk fibers are unwound from their cocoons and combined into aa single thread with a typical length of 300 yards. choose a reasonable number of silk fibers in a thread write an equation to find the total length of the silk fibersused in 300 yards of the thread

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

Write the equation in logarithmic form m^x=n