It is a function because the input does not repeat itself.
Answer:
C, the plus or minus at the end of a function stands for the point on the y axis going up or down 13.
Step-by-step explanation:
Brainlyest pls I need 1 more to level up
Answer:

Step-by-step explanation:
To solve this problem you must know the formula of subtraction of angles for the function cosx.
The formula is:

We can write 30° as: 45° - 15°
Then:

Using the formula for subtraction of angles we have:

Notice that we have achieved the expression shown in the statement
Finally:

To find the area of the figure, we divide it into two rectangles as follows:
And we find the area of each rectangle, which is given by:

Area rectangle 1:

Area rectangle 2:

Therefore, the shaded area of the diagram is:

Answer: 54 m^2