Can yall pease help and this is timed

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

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

What could explain what happened when the time was equal to 120 minutes