Answer:
Speed of river's current = 5 mph
Step-by-step explanation:
Let 'd' be the distance covered  
  Let x be the speed of the rivers current
Speed upstream = 15-x
speed downstream = 15+x
Time = distance / speed
time upstream = 
time downstream = 
the ferry trip upstream takes twice as long as its return trip downstream
 =
= 
divide both sides by d
 =
= 
cross multiply


Add 2x on both sideds

subtract 15 from both sides and divide by 3

x=5
Speed of river's current = 5 mph
 
        
             
        
        
        
Answer:
a) 0.0167
b) 0
c) 5.948
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 6.16 ounces
Standard Deviation, σ = 0.08 ounces
We are given that the distribution of fill volumes of bags is a bell shaped distribution that is a normal distribution.
Formula:
 
a) Standard deviation of 23 bags

b) P( fill volume of 23 bags is below 5.95 ounces)
P(x < 5.95)
 
 
Calculation the value from standard normal z table, we have,  
 
c) P( fill volume of 23 bags is below 6 ounces)  = 0.001
P(x < 6)  = 0.001
 
Calculation the value from standard normal z table, we have,  


If the mean will be 5.948 then the probability that the average of 23 bags is below 6.1 ounces is 0.001.
 
        
             
        
        
        
Answer:
dylan has more water
Step-by-step explanation:
1000 milliliters = 1 liter 
therefore 600 milliliters = .6 liters 
1 - .6 = .4
the liter has .4 more liters of water or 400 more milliliters 
 
        
             
        
        
        
Total number of animals at the shelter = 15 + 12 +3 + 5 = 35 animals.
Let the total number of animals be represented by 100%
There are 15 dogs and 12 cats so:
% Number of dogs  = 15/35 x 100% = 42.86%
% Number of cats  = 12/35 x 100%  =  34.28%
        
             
        
        
        
Answer:
D. The scale factor is 1:840 
Step-by-step explanation:
Make 630 ft into inches, so 7560
Then make it 9/7560, which simplifies to 1/840