Please help it is a interim test

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

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?