Answer:
The unit rate is 
Step-by-step explanation:
Let
x ----> the number of feet
y ----> represent the cost of a piece of pipe
we have

Remember that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
or
In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin
In this problem we have a proportional relationship
The unit rate is the same that the slope of the linear function or the constant of proportionality k
so

therefore
The unit rate is 
<h3>Answer:</h3>
sec²(x)
<h3>Explanation:</h3>
As required:
... = (sin²(x)/cos²(x))(1 +(cos²(x)/sin²(x))
... = (sin²(x)·(sin²(x)+cos²(x)) / (cos²(x)·sin²(x))
... = 1/cos²(x) = sec²(x)
_____
Alternatively, multiply out the given expression, then use trig identities.
... = tan²(x) + (tan(x)·cot(x))² = tan²(x) +1 = sec²(x)
Answer:
16
Step-by-step explanation:
8+8
i think its D and A I THINK.