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andreev551 [17]
3 years ago
13

Got it wrong plss help and explain

Mathematics
1 answer:
Karolina [17]3 years ago
8 0
Because it says "not black" we would do white marbles
There are 15 white marbles and a total of 20
So the fraction of white marbles to total would be 15/20

Because the answer is wanted as a decimal divide 15 by 20
15/20=.75

There is a .75 chance that she will not draw a black marble
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We have that

the expression 2f + 4f + 2 – 3-------> we can group it   (2f+4f)+(2-3)
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the expression [2f + 4f + 2 – 3] is equivalent to [6f-1]

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then
the expression [2f + 4f + 2 – 3] for f=3 is also 17

<span>let's check it
</span>[2*3 + 4*3 + 2 – 3]--------> [6+12+2-3]=[20-3]=17------> is ok
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I'm pretty sure this is right

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