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nexus9112 [7]
3 years ago
11

There are 70 students in a school band . 40% of them are sixth graders , 20% of them are seventh graders , and the rest are eigh

th graders . what percentage of the band members are eighth graders?
Mathematics
1 answer:
Flauer [41]3 years ago
4 0

Answer:

40% of the band members are eighth graders.

Step-by-step explanation:

There can only be a total of 100%.  The problem already gives us the percentages of sixth graders and seventh graders, and it tells us that there are only eighth graders left.  Subtract the sum of 40 and 20 from 100 to get your answer.

100% - (40% + 20%) = 40%

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6 0
3 years ago
In a random sample of 70 people, it was found that 44 of them were fans of the New York Yankees. What is the margin of error for
Veronika [31]
The general formula for the margin of error would be:

z * √[p (1-p) ÷ n]

where:
z = values for selected confidence level
p = sample proportion
n = sample size

Since the confidence level is not given, we can only solve for the 
<span>√[p (1-p) ÷ n]  part.
</span>
p = 44/70
n = 70

√[44/70 (1 - (44/70) ÷ 70]

√[0.6286 (0.3714)] ÷ 70

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7 0
3 years ago
What is the value of the rational expression 2x^2+5x+9/x^2+2x-1 when x=-2
Sergio039 [100]

Answer:

The value of the Rational expression when x=-2 is: -7

Step-by-step explanation:

For this exercise is important to remember:

  • When a negative number is raised to an even power, the result will be positive.
  • The multiplication of signs:

       (+)(+)=+\\(-)(-)=+\\(-)(+)=-

Then, given the following Rational expression:

\frac{2x^2+5x+9}{x^2+2x-1}

You need to follow these steps in order to find its value when x=-2:

1. Substitute the given value of "x" (x=2) into the expression:

 \frac{2(-2)^2+5(-2)+9}{(-2)^2+2(-2)-1}

2. Evaluate and simplify:

\frac{2(4)+5(-2)+9}{4+2(-2)-1}=\frac{8-10+9}{4-4-1}=\frac{7}{-1}=-7

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Answer:

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Step-by-step explanation:


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