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belka [17]
3 years ago
8

a boat traveled 210 miles downstream and back.the trip downstream took 10 hous.the trip back took 70hours.what is the speed of t

he boat in still water.what is the speed of the current
Mathematics
1 answer:
Lady_Fox [76]3 years ago
3 0
The boat rates are 21 mph and 3 mph.
to find the speed you rate times time equals the distance.
so you do,

10 × r = 210
the speed equals 21mph

70 × r = 210
the speed equals 3mph

my guess is the boat is going 21 mph and the current is 3 mph
Hope this helps
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Determine whether the normal sampling distribution can be used. The claim is p &lt; 0.015 and the sample size is n
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Complete Question

Determine whether the normal sampling distribution can be used. The claim is p < 0.015 and the sample size is n=150

Answer:

Normal sampling distribution can not be used

Step-by-step explanation:

From the question we are told that

    The  null hypothesis is  H_o  :  p =  0.015

     The  alternative hypothesis is    H_a  :  p  <  0.015

     

The  sample size is  n= 150

Generally in order to use  normal sampling distribution  

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2 years ago
3n-5=-48-40n. Please help . I need the steps to solve and the answer
liraira [26]

3n-5=-48-40n

Move -40n to the other side. Sign changes from -40n to +40n.

3n+40n-5=-48= -48-40n+40n

3n+40n-5=-48

Move -5 to the other side.

3n+40n-5+5=-48+5

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Divide by 43 for both sides

43n/43=-43/43

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Answer: n=-1

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3 years ago
Read 2 more answers
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