Answer:
Answer 2
Step-by-step explanation:
1 and 3 are not linear or not straight
4 there can't be more then one value for x
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

Answer:
number of cards in a house hold and number of siblings
Step-by-step explanation:
she started jumping rope at 7:45
Answer:
-14
Step-by-step explanation:
Well, the equation would be 8+2n=-20
2n=-28
n=-14