Many more settlers began moving west with the completion of the transcontinental railroad. the passing of the Indian Appropriations Act. the defeat of American Indians at the battle at Wounded Knee. the institution of the reservation system.

wwii

explanation:

i believe the answer is c

254.34

step-by-step explanation:

the formula for area of a circle is given by

a = pi * r^2

a = pi * 9^2

a = 81*pi

using 3.14 as an approximation for pi

a = 3.14*81

a = 254.34

demand is the need and oportunity to buy a given good or service.