Hi there!
2(4z - 9 - 7) = 166 - 46
let's make this a little more simpler...
2(4z - 16) = 120
use distributive property.
multiply 2 and 4z , 2 and -16.
8z - 32 = 120
add 32 on both sides to isolate the variable
8z = 152
divide both sides by 8...
z = 19
So your answer is A. 19
Hope this helped!! :)
I think the answer is o.o416
You have to know the measure of two angles and an included side (a side between two angles).
Answer:
see explanation
Step-by-step explanation:
Using the Addition/ Subtraction formulae for cosine
Consider the left side
cos(x - y) - cos(x + y)
= cosxcosy + sinxsiny - (cosxcosy - sinxsiny) ← distribute
= cosxcosy + sinxsiny - cosxcosy + sinxsiny ← collect like terms
= 2sinxsiny = right side ⇒ proven
