There are 3 black marbles and 4 red marbles and you pick 2 marbles out what is the probability both will be black

3/7 or 42.857142%

Step-by-step explanation:

Black= 3

Total= 7

Hence 3/7

If you want the answer in %, it would be,

3/7*100= 42.857142%

. + λrh() e 1 1 2 4 4 4 4 4 3 4 4 4 4 4 + th−1(− s(x)2 dx ω + λrh−1() e 2 1 2 4 4

step-by-step explanation:

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.