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natta225 [31]
3 years ago
15

mary went to her local Zoo where 55% of it's exhibit feature reptiles if the zoo features 20 exhibits in total how many of the z

oos exhibits feature reptiles
Mathematics
2 answers:
IceJOKER [234]3 years ago
8 0
Hello!

To find this you have to find what 55% of 20 is

You can do this by doing 20 * 0.55

0.55 is 55% as a decimal

This gives us the answer of 11

Hope this helps!
Andrew [12]3 years ago
8 0
55% of 20 exhibits are reptilian so
there is 11 exhibits that are reptilian 

55*20/100 =11

hope I helped if so mark as brainliest thanks
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16.2 miles.

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This equation comes from the 2.50 home pick-up fee; $1 for the first 0.2-mile increment; and 0.25 for each other 0.2-mile increment.

Using the distributive property, we have:
23.50 = 2.50 + 1 + 0.25*x - 0.25*1
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Combining like terms,
23.50 = 0.25x + 2.75

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23.50 - 2.75 = 0.25x + 2.75 - 2.75
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Dividing both sides by 0.25, we have:
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81 = x

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6 0
3 years ago
A recent study of 26 city residents showed that the time they had lived at their present address has a mean of 10.3 years with t
svetlana [45]

Answer:

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       The standard deviation is  s =  3

From the question we are told the confidence level is  95% , hence the level of significance is    

      \alpha = (100 - 95 ) \%

=>   \alpha = 0.05

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } =  1.96

Generally the margin of error is mathematically represented as  

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

=>   E =  1.96 *  \frac{3}{\sqrt{26} }

=>   E = 1.1532

Generally 95% confidence interval is mathematically represented as  

      \= x -E <  \mu <  \=x  +E

=>   10.3  -1.1532 <  \mu < 10.3  +  1.1532

=>    9.15<  \mu < 11.45

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3 years ago
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Factor and group common ones
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Answer:

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