Answer:
Step-by-step explanation:
d/1.6+31=40
d/1.6=40-31
d/1.6=9
d=9*1.6
d=14.4
Answer: d=14.4
------------------------
1/2b-16=-4
1/2b=-4+16
1/2b=12
b=12/(1/2)
b=(12/1)(2/1)
b=24/1
b=24
Answer: b=24
