Verified answer

1)4z=5.12

z=5.12/4

z=1.28

2)34m+40.8=61.2

34m=61.2-40.8

34m=20.4

m=20.4/34

m=0.6

3) 16.1-x+3.8=11.3

x+19.9=11.3

x=11.3-19.9

x=8.6

4) 25.34-2.7-y=15.34

22.64-y=15.34

y=22.64-15.34

y=7.3