What is the specific method called on #3

Rename mixed numbers before you can subtract are what

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

Darren earned $663.26 in net pay for working 38 hours. he paid $118.51 in federal and state income taxes, and $64.75 in fica taxes. what was darren's hourly wage? question options: $17.45 $19.16 $20.57 $22.28