Question 727634
1.  5/c = 1/c cross multiply
5c=1c
5=1 not a valid equation.

2.  0.6 = 1/m cross multiply.
0.6m=1
m=1/0.6
m=1 2/3 ans.

3.  -9=1/k cross multiply.
-9k=1
k=1/-9 
k=-1/9 ans.