Question 981253
Hi there,
The variable Z is inversely proportional to X.
Z = k/X where k = factor of proportionality
To find k
2.2 = k/5
k = 2.2 x 5 
k = 11
Formula:
Z = 11/X
Z = 11/12
Z = 0.92 (2 decimal places)
Hope this helps:-)