4/(1+3) or

Addition is the first step for two reasons.
1) the Order of Operations requires you do operations in parentheses first
2) the division cannot be performed until you know what you're dividing
Answer:
X=20
Step-by-step explanation:
Sin(x+20)=cos(2x+10)
Sin(x+20)=sin(90-(2x+10)
X+20=90-2x-10
3x=60
X=20
I'm assuming it's 10^6, so 10 would be the base, and 6 would be the exponent.
The factor is x-6 since the two factors of your equation are (6x-6) and (x-6)
A ∩ B = {2, 4} [intersection (∩) means the common terms]