Answer:
1/3
Step-by-step explanation:
1/6 ÷ 1/2
Copy dot flip
1/6 * 2/1
Multiply
2/6
Reduce
The sum would be
4x^2-x+1
add like terms.
3x^2+x^2
4x^2
4x+-5x
-x
3-2
1
5g/cm³