First of all, you must find out how many miles it takes to go 4 hours and 8 hours.
112 ÷ 4 = 28 miles per hour
112 ÷ 8 = 14 miles per hour
So, going downstream will take 28 miles per hour and going in still water will take 14 miles per hour.
Answer:
Probability is 0.3506
Step-by-step explanation:
We are given
mean is 8mm
so, 
standard deviation is 2.2 mm
so, 
x-varies from 7mm to 9mm
At x=7:
we can use formula
we can plug values
At x=9:
we can use formula
we can plug values
So, z is between -0.45455 and 0.45455
now, we can use normal distribution table
and we get
Probability is 0.3506
The value of 4 in 34 258 is 4000 - four thousand.
The value of 4 on 47614 is 40 000 - forty thousand.
The first is10 times less than the second and the second is ten times more than the first:
4000*10=40000
You can also say that the first is 0.1 times the second.
Make a diagonal line like this / connected to it make the same / but mirrored or backwards underneath make a connecting like this _
