Answer:
use desmos online. itll graph it for you.
Step-by-step explanation:
The above questions answer is 8 and 14
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

The answer is permutation. It is <span>the action of changing the arrangement, especially the linear order, of a set of items.
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