♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️



Collect like terms


♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️
Answer:
Step-by-step explanation:
21 feet below is written as -21
9 feet up is written as +9
So we have -21 + 9 = -12 or 12 feet below sea level
The answer is -6. Thought there is a chance I am wrong. Need an explanation?
100%-20%=80%
discount:250*20%=50
price of soft drinks:250*80%=200