What formula would be used to represent the following sequence 3,8,13

I am pretty sure this is Arithmethic sequence. They add a common difference in the midle of two different terms in order to get to the next term.

Explanation:

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

answer; i believe that the correct answer is (tobacco);