3*3*3=9 perhaps?? And then it would be in Surface Area??
Answer:
Step-by-step explanation:
The slope of line 2=
=0
Answer:
Speed of boat in still water is 6km/h
Speed of current is 4km/h
Step-by-step explanation:
We know speed = distance / time
Let the speed of boat in still water be x
Let the speed of current be y
Hence the speed of boat, down stream = 
Distance downstream = 20km
Time taken = 2 hours
We have

......(1)
Speed of boat upstream = 
Distance upstream = 4
Time taken = 2
We have

...(2)
Adding (1) & (2)


Substituting in (1) we get

Domain is the set of number you can use for x
we can use any number for x
the domain is all real numbers
answer is last one