Mathematics: Out of 18 people in a room, 2 have red hair. What is the probability that a person picked at random from the room does NOT have red hair? Give an explanation plz:)

The discriminant must be zero.Step-by-step explanation:Quadratic EquationThe standard representation of a quadratic function is:where a,b, and c are constants.The zeros, roots, or x-intercepts can be found by solving the equation:We can use the quadratic formula to find the roots:Note this formula gives us two different roots if the square root is non-zero.The only way there can be only one x-intercept is because the square root is zero.If the square root is zero, thenThe expression is called the...

Out of 18 people in a room, 2 have red hair. What

Ответ:

rachelsweeney10

20.05.2021

Mathematics

Answer :

Total number of people in the room = 18Number of people with red hair = 2Number of people not with red hair = 18 - 2 = 16Probability of picking a person who doesn't have red hair = $\sf\dfrac{Number\:of\:favourable\:outcomes}{Total\:outcomes}$

Probability = 16/18

Reduce the fraction with 2

Probability = 8/9

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Ответ:

devin7943

05.12.2020

Mathematics

The discriminant must be zero.

Step-by-step explanation:

Quadratic Equation

The standard representation of a quadratic function is:

f(x)=ax^2+bx+c

where a,b, and c are constants.

The zeros, roots, or x-intercepts can be found by solving the equation:

ax^2+bx+c=0

We can use the quadratic formula to find the roots:

$\displaystyle x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Note this formula gives us two different roots if the square root is non-zero.

The only way there can be only one x-intercept is because the square root is zero.

If the square root is zero, then

b^2-4ac =0

The expression is called the discriminant.

Thus, if x=-3 is the only x-intercept of the graph of a quadratic function, then the discriminant must be zero.

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Out of 18 people in a room, 2 have red hair. What is the probability that a person picked at random from the room does NOT have red hair? Give an explanation plz:)

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Out of 18 people in a room, 2 have red hair. What is the probability that a person picked at random from the room does NOT have red hair? Give an explanation plz:)