Answer:
I think its 12.56
Step-by-step explanation:
Multiply 4 and 3.14(thats pi)
Answer:
1400
Step-by-step explanation:
hope that helps <3
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

That is a decrease of 78 ounces
I would say that the answer is probably 40