Answer:
the reference angle is given by 
sine = negative
cosine = positive
tangent = negative
Step-by-step explanation:
We have been given the angle 
The angle lies in Quadrant IV. Hence, in order to find the reference angle, we can subtract this angle with 
Therefore, the reference angle is given by

In Quadrant IV, cosine and secant functions are positive and rest trigonometric functions are negative.
Thus, we have
sine = negative
cosine = positive
tangent = negative
Answer:
158 feet below sea level
Step-by-step explanation:
110 + 48 = 158
So 158 was the seal's final depth below sea level
For this case we have that by definition, a linear function is of the form

We have the following options:
A) 
Rewriting:

It's a quadratic function!
B) 
Rewriting:

It's a linear function!
C)
Rewriting:

It's a cubic function.
D) 
Rewriting:

It's a quadratic function!
E)
Rewriting:

It's a cubic function!
Answer:
The linear function is option B
Tan would equal around 1.54