What of the following led to a stalemate in the early years of WWI? A)the use of poison gas

B)fighter planes

C)trench warfare

D)U-boat attacks

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69

this act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.

b. the right to wage war and make peace