Answer:
Division then subtraction
Step-by-step explanation:
You divide the $100 to 4 people, which means they each get $25. Then you subtract $15 from $25
Not sure about the other one
Answer:
-8g + 16 + 12t
Step-by-step explanation:
multiply 4 with -2g
multiply 4 with 4
multiply 4 with -3t
Answer:
Dependent variable: time(months) or 
Independent variable: 6
Step-by-step explanation:

(h=height)
The significant components, the radius and the height, are in inches and feet respectively, you'd need to convert them both to the same unit, whichever it may be, meters or feet or inches or millimeters, so long is the same, then use the volume of a cylinder equation to get it.
There are 5,280 feet in a single mile.
Which is equivalent to 1,760 yards.