Answer:
19.2 but if u cant us decimals take out 2
Step-by-step explanation:
you time 8 by 12 and then divide it by 5
Answer:
8/3x + 6 (first option)
Step-by-step explanation:
Well youc an use the destructive property, multiply 2/3 with each number in this expression
2/3* 4x= 8/3x
and
2/3 *9 is 6
Now just plug it in as usual
8/3x+6
Answer
36
Step-by-step explanation:
Answer:
-7.5 x 10^1
Step-by-step explanation:
subtract numbers and exponents and make sure that number is between 1 and 10.
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 = ![x+y](https://tex.z-dn.net/?f=x%2By)
Distance downstream = 20km
Time taken = 2 hours
We have
![x+y=\frac{20}{2}](https://tex.z-dn.net/?f=x%2By%3D%5Cfrac%7B20%7D%7B2%7D)
......(1)
Speed of boat upstream = ![x-y](https://tex.z-dn.net/?f=x-y)
Distance upstream = 4
Time taken = 2
We have
![x-y=\frac{4}{2}](https://tex.z-dn.net/?f=x-y%3D%5Cfrac%7B4%7D%7B2%7D)
...(2)
Adding (1) & (2)
![2x=12](https://tex.z-dn.net/?f=2x%3D12)
![x=6](https://tex.z-dn.net/?f=x%3D6)
Substituting in (1) we get
![y=4](https://tex.z-dn.net/?f=y%3D4)