Here is the answer.
You just have to remember the given formula.
Answer:
80 minutes
Step-by-step explanation:
Work done by Mark in 1 minute = 1/120
Work done by Alexis in 1 minute = 1/240
Work done by Mark and Alexis in 1 minute = 1/120 + 1/240

They both can load all the packages in 80 minutes.
Answer:
(x + 4) (x -2)
Step-by-step explanation:
if you need more of an elaborate answer ask me.
Answer:
D
Step-by-step explanation:
7.32 is the radius because all you have to do is reverse the formula for circumference