Abag with 7 marbles is shown below. a marble is chosen from the bag at random. what are the odds in favor of choosing a black marble?

there are 4 black marbles and totally 7 marbles

p(black marble) =4/7

Odds in favor of black marble = 4:3

odds 4:3

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two