Answer:
D. Brief
Explanation:
brief is the opposite of prolonged.
I would say this is a complex sentence. Because it has one independent clause(their more aggressive style did not pay of.) and two dependent clauses.
Answer:
The answer is below
Explanation:
A Three step equation is an equation that takes three steps to solve, this means that you have to perform three operations before it can be solved. It is usually in the form:

Given a two step equation (i.e it takes two steps to solve), in the form of px + q = r. To make it a three step equation, they are two methods:
1) Multiply it by a constant so it would be in the form:
a(px + q) = r
2) Divide it by a constant so it would be in the form:

An example is 2(3x - 5) = 2(19) of (3x - 5)/2 = 19/2
Answer:
D.
Explanation:
D states the main idea of the passage.
All the others support D.