The answer is = because all of the other dimensions to the triangles are equal.
The answer to this question is E.
Answer:
D
Step-by-step explanation:
loudness depends on the amplitude or height of the sound waves
Answer:
90 engines must be made to minimize the unit cost.
Step-by-step explanation:
Vertex of a quadratic function:
Suppose we have a quadratic function in the following format:

It's vertex is the point 
In which


Where

If a>0, the minimum value of the function will happen for 
C(x)=x²-180x+20,482
This means that 
How many engines must be made to minimize the unit cost?
x value of the vertex. So

90 engines must be made to minimize the unit cost.
Answer:
(1,1), (-1,1)
Step-by-step explanation:
To reflect a point over the x-axis, simply make its x-value negative. So, we can take the sample point of (1,1), make its x-value negative, and get (-1,1).