Airplanes were vital for ww1 to ease transport of amo and soon guns on the planes including bombs this made it easier for to launch quick air strikes on places like bases vulnerable to air strikes
Answer
4 and 5
Explanation
A constant term in an expression is a term that does is independent of any variables. This means that constant term will have non of the variables 
attached to them. In the expression 
we notice that the terms integers 4 and 5 are the only terms that are not coefficients of any of the variables in the expression.
Answer:
Incomplete question there is a passage to be read.
Passage
About the hour of ten o’clock, the whole plain was crowded with horsemen, horsewomen, and foot-passengers, hastening to the tournament; and shortly after, a grand flourish of trumpets announced Prince John and his retinue, attended by many of those knights who meant to take share in the game, as well as others who had no such intention.
The answer is option C
A powerful monarch backed by a noble fighting class.
Explanation:
It is already describe in the passage how the fighting class were loyal to their nobles, as well as the culture from before was derived of the people in the passage. Monarch is a sovereign head of state, especially a king, queen, or emperor.
Nobility is a social class normally ranked immediately under royalty and found in some societies that have a formal aristocracy. Nobility possesses more acknowledged privileges and higher social status than most other classes in society.
The steam boat
The cotton gin and others
