Abag contains eight marbles of equal size and weight. one marble is red, two marbles are white, and five marbles are blue. a marble is taken from the bag two times. each time a marble is taken out, it is not replaced. what is the probability of picking a blue marble both times?

There are 5 blue marbles out of 8.

The first pick would be 5/8

After picking the first marble, there would be 4 blue and 7 marbles.

The second pick would be 4/7.

Picking blue both times would be 5/8 x 4/7 =  5/14

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft