Astock character is one that's
a. constantly changing and adapting to situations.
b. typically one-dimensional with a dominant quality.
c. always involved in some type of internal conflict.
d. familiar and commonly used in many stories.

answer; i believe the correct answer is (75 years);

x=3

step-by-step explanation:

this is really simple i saw that there was only one term (5x) and thought if that was 15 what would i have to multiply everything else to get it there? well if 5x became 15 then x would have to be 3 so plug the 3 in the x for the other equations and you get 15 for the other ones. so there you go. : )