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tigry1 [53]
3 years ago
15

A bag contains 45 marbles of various colours. Lena draws 48 times, each time replacing the marble before drawing again. She gets

a total of 16 red marbles. Which is the best prediction of how many red marbles are in the bag?
A) 3

B) 13

C) 15

D) 16
Mathematics
2 answers:
sergiy2304 [10]3 years ago
5 0
I think the answer is c im not sure sorry
Anna11 [10]3 years ago
4 0

Answer:

Your Answer is Option C

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Answer:

x_1=\frac{5+\sqrt{33}}{4}≈2.69

x_2=\frac{5-\sqrt{33}}{4}≈-0.19



Step-by-step explanation:

 To solve this problem you  must apply the proccedure shown below:

1. You have that the quadratic formula is:

x=\frac{-b+/-\sqrt{b^{2}-4ac}}{2a}

2. To solve the quadratic equation you must substitute the values. So, you have that:

Rewrite the equation:

2x^{2}-5x-1=0

a=2\\b=-5\\c=-1

Then you have:

 x=\frac{-(-5)+/-\sqrt{(-5)^{2}-4(2)(-1)}}{2(2)}

3. Therefore, you obtain the following result:

x_1=\frac{5+\sqrt{33}}{4}≈2.69

x_2=\frac{5-\sqrt{33}}{4}≈-0.19


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