Step-by-step explanation:
1. 
<u>Combine Like Terms:</u>
<u>Answer:</u> 
G
2. 
<u>Combine Like Terms:</u>
<u>Answer:</u> 
B
3. 
<u>Combine Like Terms:</u>
<u>Answer:</u> 
I
4. 
<u>Combine Like Terms:</u>
<u>Answer:</u> 
H
Your code is, GBIH
Answer:
C
Step-by-step explanation:
4 - -2
,...........................
Answer:
(9x²)²
Step-by-step explanation:
Given the expression 81x⁴, to write the expression as a square of a monomial, first we will assign a variable to the expression.
y = 81x⁴
Then we take the square root of both sides of the expression
√y = √81x⁴
y^½ = √81 × √x⁴
y^½ = 9x²
Squaring both sides of the resulting equation to get y back
(y^½)² = (9x²)²
y = (9x²)²
The expression as a square of a monomial is (9x²)²
You can do C(6,2) which gives

which is
15!