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Stella [2.4K]
3 years ago
9

A school band consists of 45 boys and 50 girls of the total number of boys 18 play the drums What percent of the boys play the d

rums ?
Mathematics
1 answer:
mixer [17]3 years ago
3 0
We can solve this problem by the rule of three.
45 boys-------------100 %
18 boys--------------  x


x=(18 boys * 100%) / 45 boys=40 %


Answer: 40% of the boys play de drums.



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The difference of two numbers is 3. their sum is 14. find the two numbers. (show work please)
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Let's say the larger number is x. that means that the smaller number is x - 3. since you know their sum is x + x - 3, and that is equal to 14. so you have the equation x + x - 3 = 14. combine like terms (x) to get 2x - 3 = 14. add three to both sides to get 2x = 17. divide both sides by two to get x = 17/2. so the larger number is 17/2, and the larger number is 11/2 (17/2 - 3 = 11/2)
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Step-by-step explanation:

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Consider the function f ( x ) = − 2 x 3 + 27 x 2 − 108 x + 9 . For this function there are three important open intervals: ( − [
Darya [45]

Answer:

<em>A=3 and B=6</em>

Step-by-step explanation:

<u>Increasing and Decreasing Intervals of Functions</u>

Given f(x) as a real function and f'(x) its first derivative.

If f'(a)>0 the function is increasing in x=a

If f'(a)<0 the function is decreasing in x=a

If f'(a)=0 the function has a critical point in x=a

As we can see, the critical points may define open intervals where the function has different behaviors.

We have

f ( x ) = - 2 x^3 + 27 x^2 - 108 x + 9

Computing the first derivative:

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We find the critical points equating f'(x) to zero

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Simplifying by -6

x^2 -9 x +18=0

We get the critical points

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They define the following intervals

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Thus A=3 and B=6

3 0
3 years ago
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