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Damm [24]
4 years ago
8

4 of 9 © Express the ratio below in its simplest form. 3.5:4.5

Mathematics
2 answers:
kaheart [24]4 years ago
8 0
I think it’s already in it’s simplest form. I think...
MariettaO [177]4 years ago
8 0

Answer:

7/9

Step-by-step explanation:

35/10:45/10=35/10*10/45=35/45=35:5/45:5=7/9

or

3.5/4.5=(3.5*2)/(4.5*2)=7/9

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There are 25 students performing in the holiday concert. Of the students, 11 are boys. What percent of the students are boy's? P
Mademuasel [1]
Divide 11 by 24 and you get 0.44
So 44% of the holiday concert are boys.
3 0
3 years ago
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A random sample of 64 students at a university showed an average age of 20 years and a sample standard deviation of 4 years. The
adelina 88 [10]

Answer:

The 90%  confidence level is  19.15<  L  <   20.85

Step-by-step explanation:

From the question we are told that

     The sample size is  n =  64

     The mean age is  \= x  =  20  \ years

      The standard deviation  is   \sigma  =  4 \ years

 

Generally  the degree of freedom for this data set is mathematically represented as

        df  = n -  1

substituting values

        df  = 64 -  1

        df  = 63

Given that the level of confidence is  90%  the significance level is mathematically evaluated as

          \alpha  =  100 - 90

         \alpha  =10 %  

         \alpha   = 0.10

Now   \frac{\alpha }{2}  =  \frac{0.10}{2}  = 0.05

Since we are considering a on tail experiment

The  critical value for half of  this significance level at the calculated  degree of freedom is obtained from the critical value table as

           t_{df, \frac{ \alpha}{2}   } = t_{63,  0.05   } =  1.669

   The margin for error is mathematically represented as

          MOE  =  t_{df ,  \frac{\alpha }{2} } *  \frac{\sigma}{\sqrt{n} }

substituting values  

          MOE  = 1.699  *   \frac{4 }{\sqrt{64} }

         MOE  = 0.85

he 90% confidence interval for the true average age of all students in the university is evaluated as follows

           \= x - MOE  <  L  <  \= x  + E

substituting values  

         20  - 0. 85 <  L  <   20  + 0.85

         19.15<  L  <   20.85

4 0
3 years ago
When the town of Bradyville first started its voluntary recycling program, 1500 of the town’s residence participated. The town p
kirza4 [7]
Answer: an = 1500(1.15)^n (It looks like you have a typo in the third choice)

This is an example of an exponential equation. 
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A is the starting amount, b is the rate and x is the number of years.

All you have to do is put the pieces in place. Since it is a 15% increase, we are using 1.15 for the rate. And the starting value (a) is 1500.
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radius is 3, circumference is 18.85
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Season the Texans won 4 out of 12 games. What percent of games the Texans in last season?​
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Answer:

This question sounds incomplete

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