The graph shows the number of each kind of book in hero's personal library. a book is chosen randomly. what is the probability that the book chosen is a biography? a)2/15 b)4/15 c)1/30 d)1/4

From the graph, it is found that there is a probability that the book chosen is a biography, and the correct option is given by option A.

In this problem:

Thus:

probability that the book chosen is a biography, and the correct option is given by option A.

A similar problem is given at link

A is the right answer .Probability of the book chosen is a biography is .

Step-by-step explanation:

According to the given graph or pie chart

The number of biography books=4

Total books= Romance books+ Science fiction books+ Biography books+Adventure books =2+14+4+10=30

Let B be the event of choosing a biography book then

Probability of the book chosen is a biography P(B)=

Therefore, Probability of the book chosen is a biography is  .

28

step-by-step explanation:

because that's the answer

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0