The answer is -1 , because when you add a negative number to a positive number the negative number will subtract , and vise versa.
Answer:
Option D. 3.73
Step-by-step explanation:
we know that

and

step 1
Find cos(X)
we have

we know that

substitute




step 2
Find tan(x)

substitute

step 3
Find sin(y)
we have

we know that

substitute




step 4
Find tan(y)

substitute

step 5
Find tan(x+y)

substitute
![tan(x+y)=[1/\sqrt{3}+1}]/[{1-1/\sqrt{3}}]=3.73](https://tex.z-dn.net/?f=tan%28x%2By%29%3D%5B1%2F%5Csqrt%7B3%7D%2B1%7D%5D%2F%5B%7B1-1%2F%5Csqrt%7B3%7D%7D%5D%3D3.73)
C. is the answer because -159 is a rational number
To find the slope, use y2-y1/x2-x1
In this case, it is -7-3/4-(-1)
-10/5
-2/1
That is the same as -2, so the answer is -2