Answer:
poop lol
Step-by-step explanation:
Answer
What expression represents her age 7 years from now?
y =x+7x
Two years ago?
z=y-2x
Step-by-step explanation:
Answer:
31 pieces
Step-by-step explanation:
6 + 5 x 5 = 31
Answer:
x = 180
Step-by-step explanation:
First, you need to know
1. Double-angle formula:
cos(2x) = 
2. Pythagorean identity:

Back to your problem, replacing the variable by the above:

By Double-angle formula
By Pythagorean identity
Given 



, we know -1 < sinx < 1, for every x ∈ R


