17-9=8 (not 18) 8-7=11 is the answer.
46 = 63 - 17
13. (9+17)/2=13
The average of 7, 8, 9, and 4 is 7.
A Possible Answer could be: 70 9 12 12 10 5 1
Average = 13
The average is 17.
5, 7 and 17 are prime.
13
Are you trying to say 17 + 6 + (7-9) ? = 21
There is no mode average. The median average = the mean average = (-2 + 17) ÷ 2 = 7½ = 7.5
The average is 15.