C. grades in courses because it depends on how much the students study to get their grades
Answer:
20%
Step-by-step explanation:
Change 30 hours into minutes, then divide by 20 and 25
Answer:
p(14,9)
Step-by-step explanation:
steps are in picture.
Note: if you have any question about it you can ask.
Answer:
-7
Step-by-step explanation:

it is possible because x is just a letter representing the unknown nos