Answer:
Number 11 55
Number 12 7
Number 13 -9
Number 14 -8
Number 15 6
Number 16 6/21
Number 17 6/45
Number 18 3/10
Number 19 1/2
Number 20 1/5
Number 21 x⁶
Number 22 a¹²b⁴
Number 23 9
Number 24 15
Number 25 1
Number 26 1
Number 27 1
Number 28 12x
Number 29 8x3y
Number 30 100 000
