Answer:
$6.34
Step-by-step explanation:
15.86 / 2.5 = 6.34
3x(x2 + 2x – 6) + 4(x2
– 6x + 2)
So average of a set of values is the sum of given values divided by the number of values
So, in this case the given values are 12, 9 , 4 , 8 ,7 and x (letting the 6th friend's time be x)
so the average will be:
(12 + 9 + 4 + 8 + 7 + x)/6 = 9
40 + x = 54
x = 54 - 40
x = 14 hours
M = -2
