Acan contains 18 marbles six red, four white, three blue, and five black, one marble is drawn without looking. what is the probability of selecting a red or black marble?

11:7

Step-by-step explanation:

There are 6 red, 4 white, 3 blue, and 5 blacks

We are asking the probability of black or red so we add 6 + 5 = 11

the rest is 7 so it is 11:7

11:7

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step-by-step explanation:

in the math equation 8 x 7 = 56, the 8 and the 7 are both factors of 56, since in this lesson we will use square tiles to figure out the factors of a whole find as many different arrays as you can, but follow one important rule: all the rows must have the i can make two rows of nine, so 2 and 9 are both factors of 18.

step-by-step explanation: