1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alik [6]
3 years ago
8

a train leaves little rock, arkansas and travels north at 70 kilometers per hour. another train leaves at the same time and trav

els south at 80 kilometers per hour. how long will it take before they are at 450 kilometers apart
Mathematics
1 answer:
jekas [21]3 years ago
8 0
45 hours.
80 - 70= 10, and 450/10 is 45.
to justify, you can do 70x45= 3,150, and 80x45= (3,600 - 3,150= 450)
You might be interested in
Mike wants to make meatloaf. His recipe uses a total of 5pounds of meat
Vikki [24]

Answer:

question

Step-by-step explanation:

3 0
3 years ago
Please solve find perimeter
babunello [35]

Answer:

12???

Step-by-step explanation:

5 0
3 years ago
Lisa is getting paid 96$ per hour, her salary per hour increases by 12%, how much is she getting paid now after in increases by
Bas_tet [7]

Answer:

96$/12×100

=8 × 100

=800$

5 0
2 years ago
Read 2 more answers
What is the solution to:<br><img src="https://tex.z-dn.net/?f=6%20%5Cgeqslant%20%20%5Cfrac%7B1%7D%7B2%7D%20x%20%2B%2021" id="Tex
Vladimir79 [104]
I really hope this helps. Btw x<-30

7 0
3 years ago
Bob Nale is the owner of Nale's Texaco GasTown. Bob would like to estimate the mean number of litres (L) of gasoline sold to his
Fudgin [204]

Answer:

a

  The point estimate of the population mean is  \= x  =  56

b

  The 80% confidence level is  50.57 <  \mu  < 61.43

c

  There is  80% confidence that the true population mean lies within the confidence interval.

Step-by-step explanation:

From the question we are told that

   The  sample size is  n =  18

   The  standard deviation is  \sigma  =  18 \ L

   The  sample mean is  \= x  =  56

Generally the point estimate of the population mean is equivalent to the sample mean whose value is  \= x  =  56

Given that the confidence interval is 80% then the level of significance is mathematically represented as

      \alpha  =  100 -  80

      \alpha =  20 \%

      \alpha = 0.20

Next we obtain the critical value of  \frac{\alpha }{2} from the normal distribution table

 The  value is   Z_{\frac{ \alpha }{2} } =  1.28

 Generally the margin of error is mathematically evaluated as

          E =  Z_{\frac{\alpha }{2} } * \frac{\sigma }{\sqrt{n} }

=>       E =  1.28 * \frac{18 }{\sqrt{18} }

=>       E =  5.43

     Generally the 80% confidence interval is mathematically represented as

    \= x  - E  <  \mu  < \= x  + E

=>    56  - 5.43  <  \mu  < 56  + 5.43

=>   50.57 <  \mu  < 61.43

The  interpretation is that there is  80% confidence that the true population mean lies within the limit

3 0
3 years ago
Other questions:
  • Please help im so stupid
    9·1 answer
  • Consider two people where one person is 25​% taller than the other but proportioned in exactly the same way.​ (That is, the tall
    5·1 answer
  • The median number of cars sold by 11 sales representatives in a certain month is 6. The range of a number of cars sold by those
    10·2 answers
  • What is 525/1000 in simplest form?
    11·1 answer
  • A restaurant bought 5 pounds of salmon for $42.50. How much would 7 pounds of salmon cost? *
    6·1 answer
  • If Denise and Alex add a 15% tip after the tax is applied, what is the total cost, including tip?
    13·1 answer
  • For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 33 beats per minute, the mean of the l
    9·1 answer
  • Desiree has $36 in her bank account. She spends $14.50 on dinner and tickets to a basketball game.
    8·1 answer
  • A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100
    15·1 answer
  • Answet please and please show work
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!