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3 years ago

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A bag contains 5 blue marbles, 6 red marbles, and 9 green marbles. Two marbles are drawn at random, one at a time and without re

placement. What is the probability of selecting two blue marbles?
A. 9/20 B. 3/38 C. 1/19 D. 11/20

2 answers:

JulsSmile [24]3 years ago

8 0

B is the correct answer.

slega [8]3 years ago

4 0

The answers is C) 1/9

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andre [41]

Answer : $\frac{49}{4}$

Given expression is $x^2 - 7x + c$

To make perfect square trinominal we use completing the square method

In completing the square method we add and subtract the half of square of coefficient of middle term

Here coefficient of middle term is -7

Half of -7 is $\frac{-7}{2}$

Square of $\frac{-7}{2}$ is $(\frac{-7}{2})^2$ = $\frac{49}{4}$

So the expression becomes $x^2 - 7x + [tex] \frac{49}{4}$ that gives perfect square trinomial

Hence , the value of 'c' is $\frac{49}{4}$

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(You could also write it y-4=-2x-6)

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