Step 1: Convert
, which is in radians into degrees. To convert it multiply by 

900/12
75
Step 2: 75 degrees isn't on the unit circle but 45 degrees and 30 degrees is. Since 45 + 30 = 75 you can use the cosine of 45 and 30 to find the exact value
cos45 = 
cos30 =
Step 3: Add the cos45 and cos30 to get cos5pi/12

Hope this helped!
-5 is for f(x)=x+5
4 is for g(x)=x-4
Hope this helps!!
The other endpoint (x,y)
(X+18)/2 = 16 then x=14
(Y-18)/2 = -16 then y=-14
Answer: 
Step-by-step explanation:
Remember the logarithms properties:

Then,simplifying:

Apply base 8 to boths sides and then solve for "x":
