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Inga [223]
3 years ago
9

There are 19 children in Irene's preschool class. During free time yesterday, 7 of them chose to play dress-up. What is the expe

rimental probability that a randomly selected preschooler would choose to play dress-up today?
Mathematics
1 answer:
ICE Princess25 [194]3 years ago
6 0

Answer:37%

Step-by-step explanation:

There are 19 children, so the denominator is 19.

There were 7 playing dress-up, so the numerator is 7.

The fraction is \frac{7}{19}. 7/19=0.3684~0.37

To convert decimals into percentage, mulitply by 100 and use a percent sign.

0.37*100=37%

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2 years ago
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We are given sides of the triangle by expression

First side : n

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Third side : l = 5/4 m - n.

Perimeter is 90.

Therefore, first equation could be set :

n +m +l = 90   --------------equation(1)

Second equation would be

m = 5n-5        --------------equation(2)

Third equation would be

l = 5/4 m - n   --------------equation(3)

Let us solve the system of equations by substitution.

Substituting m = 5n-5 and l = 5/4 m - n in first equation.

We get

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Now, substituting m = 5n-5 in above equation we get

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5n + 6.25n -5-6.25 = 90.

11.25n-11.25 = 90

Adding 11.25 on both sides, we get

11.25n-11.25+11.25 = 90+11.25

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Dividing both sides by 11.25, we get

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Plugging n=9 in 2nd equation.

m = 5(9)-5 = 45 -5 = 40.

Plugging n=9 and m=40 in first equation, we get

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49-49 +l = 90-49

l = 41.

Therefore, sides are of lengths l = 41, m= 40 and n=9.


5 0
3 years ago
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