Answer:
True
Step-by-step explanation:
Y can be repeated but X can't
I think Mark's sister would be 1 1/2 and Mark is 12 1/2 right now.
Answer:
7 hours
Step-by-step explanation:
if she excercises an hour a day for 7 days that would add up to 7 hours
Answer:
4
Step-by-step explanation:
7h-15h+40=-72
-8h=-32
h=4
Answer: 448
Step-by-step explanation: