Which of the following made farming difficult for farmers on the great plains?
a. heavy flooding
b. long railroads
c. low rainfall
d. poor, rocky soils

low rainfall, rocky soil and i would say long roads but not completely sure

Explanation:

Bitter cold winters, low rainfall, drought and dust storms. Tough, hard soil eroded by fierce winds and dust storms that was generally considered unsuitable for farming.

1) the degree of the function is odd, so the ends of the graph continue in opposite directions. because the leading coefficient is positive, the left side of the graph continues down the coordinate plane and the right side continues upward.