Answer:
v = 22.59
Step-by-step explanation:
all you need is contained in this sheet
Assuming that there are plus signs between the 6, 2, and 9 the answer is 21x+20
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 :)