The advantage Germany gained when Russia withdrew from the war was balanced by the?
A. entry of Italy on the Allied side.
B. departure of Austria from the war.
C. arrival of American troops in Europe.
D. invasion of Belgium.

C. arrival of American troops in Europe.

Explanation:

The arrival of US troops and their participation in the war in 1918, tipped the balance in favor of the Western Allies ultimately. Despite the end of the Eastern Front after Russia´s withdrawal from WWI, Germany faced additional pressure it could not deal with and was forced to ask for a cease-fire and negotiations.

answer: this problem has only trivial solutions, with all points on the same line. x=5 or x=7/5.

step-by-step explanation:

there are three triangles, and three unknowns: x, y=length of middle segment, and z=cos(angles marked with red arc).

we need

and law of cosines,

the three equations are

see attached image for solution.

the three answers (for plato at least) are:

b-condemned sola fida 

d-set rules for establishing seminaries and for educating clerics in the seminaries 

f-recommended moderation in the sale of indulgences and banned the sale of false indulgences