Well, since it is asking for an average, we have to add
78+89+87+96=
350... then we divide by 4
which would be 87.5 which IS greater than 80 :)
and less than 90 :)
Answer:

Step-by-step explanation:
Collect like terms

Collect like terms again and you get 
Hope this helps ʕ•ᴥ•ʔ
Answer:
0.05 periodic.
Step-by-step explanation:
let's do 52/936.
5(100)= 500
5(90)= 450
5(8)= 40
500+450+40= 990
The answer is 990. Hope this helps!