How were airplanes used during world war i? select the two correct answer
a. they were disassembled and their parts were used for other purpose
b. they were used to observe enemy troops from the air.
c. they were used overseas to broadcast information to the public.
d. they were armed with weapons and used for battle.
e. they were used to scout ideal locations for digging trenches.
the answers for the question is : b and d
the whole quick check for americans in the trenches
1. b and d
2. c
3. b
got

1. B and D

2. C

3. B

Explanation:

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.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.