Answer: 9, 1/20, 9/20
Step-by-step explanation:
1) 9 pieces
2) Size of each pieces:

3) Area of the shaded rectangle:

We know from the slope intercept form that y=mx+b so the y intercept is 12 while every hour the cost goes up by 8
Answer:
-12
Step-by-step explanation:
-4-(5+3)
-4-(8)
-4-8
-12
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
