Historians divide a particular duration of time with a distinct start and end date into:
A. a decade.
B. a century.
C. a period.
D. an epoch.

C.Period

Explanation:

a decade=10 years

a century=100 years

a period=is a duration of time of an event from start to end

the keystone school offers flexible education programs that each student achieve their unique dreams and goals. whether your student wants to study full time or just needs individual classes, we offer courses for grades k–12 from credit recovery to world languages and ap®. students can enroll at any time.

explanation:

ok, so basically your gonna start with 350 ok. so there's 60 seconds in a minute so that means you he can go up 10 ft per minute. soo, after 3 minutes he should be at 260 ft after three minutes : )