There are 3 black marbles and 4 red marbles in a bag. what is the probability of picking a black marble, replacing it back in the bag, and then choosing another black marble? 1) 3/8 2) 9/49 3) 5/13 4) 1/7

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

the first one

step-by-step explanation:

just id the test.