Answer:
27. C
28. D
Step-by-step explanation:
The average of all grades in his fencing class, including the upcoming one, (all grades summed up divided by the amount of grades) must be equal to 86 (percent), hence C is the right answer for 27.
Solving this equation gives:

So D is the right answer for 28.
Answer:
360
Step-by-step explanation:
The sum exterior angles of any number of side polygon is always 360
Answer:
B of course you dummy
Step-by-step explanation:
Answer:
4
4z+4
Divide each term of 4z+4 by 4 to get 1+z.
1+z
Answer: x=1
Step-by-step explanation: I don't know how to explain it.