Farmers
Great
Plains
Eastern
Cities
Crops and food
How did the railroads impact the relationship between eastem cities and the Great Plains?
O Railroads brought settlers to cities in the East, and crops and food to farms in the Great Plains.
O Railroads brought crops and food to cities in the East, and settlers to farms in the Great Plains.
O Railroads brought settlers west, but did not bring anything east, so the relationship was not equal.
O Railroads brought crops and food east, but did not bring anything west, so the relationship was not equal.

i have no clue at all sorry

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for