Answer:
Option B
Step-by-step explanation:

X-30+x-30+x=180
3x-60=180
3x=240
X=80
Answer:
4x²
Step-by-step explanation:
Your equation is 4x² - 6x² + 7x² - 20x² + 19x².
Since they all have the same variable, simply combine them all to find your answer.
4x² - 6x² + 7x² - 20x² + 19x²
-2x² + 7x² - 20x² + 19x²
5x² - 20x² + 19x²
-15x² + 19x²
4x²
8$ If the sale is 75% then it would be 8$ because 2x4 is 8 and 3/4 of the is 2.