Just use Photomath it helps a lot
Answer:

Step-by-step explanation:

Expand brackets

Final Answer is

Answer:
B
Step-by-step explanation:
I am assuming that the university has much more than 100 students so 100 people is just a small sample.
Answer:
-9
Step-by-step explanation:
you'd add 2 to the -11 which would equal -9 and leave you with x=-9
Answer:
-3x+3y-15
Step-by-step explanation:
;)