2+1/3n=8 is the answer, I believe.
Answer: 
Step-by-step explanation:
The first step is to make the division of the fractions
and
. To do this, you can flip the fraction
over and multiply the numerators and the denominators of the fractions. Then:

Reduce the fraction
:

Now you can make the subtraction: in this case the Least Common Denominator (LCD) will be the multiplication of the denominators. Divide each denominator by the LCD and multiply this quotient by the corresponding numerator and then subtract the products. Therefore you get:

Answer:
D. The horizontal cross-sections of the prisms at the same height must have the same area.
Step-by-step explanation: I dont know what the guy above is saying but this is the right answer

You pass the free terms wich don't contain 'x' in the othe part of the equal with changed signe ans the same for the terms wich contain x.
Answer:
Degree 4
Step-by-step explanation:
Expression:
3x^3 + 3x^2y^2 - y^2
- 3x^3 - degree 3
- 3x^2y^2 - degree 2+2 = 4
- y^2 - degree 2
So the expression has degree 4 as per the highest degree of the terms