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Fofino [41]
3 years ago
7

What is 0.5-0.2x=0.3(x+3) ?

Mathematics
1 answer:
KIM [24]3 years ago
6 0
0.3(x + 3 ) = 0.3x + 0.9 ;
We solve the equation 0.5 - 0.2x = 0.3x + 0.9   /  - 0.3x;
0.5 -0.2x = 0.9   / -0.5;
-0.2x = 0.4        / × 10 ;
-2x = 4             / ÷ ( - 2 );
x = -2 ;
The solution of the equation is -2 .
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Answer:

the probability that at least one envelope is a yellow envelope is 16/21

Step-by-step explanation:

The probability that at least one envelope is a yellow envelope is P(Y);

P(Y) = 1 - P(Y)'

P(Y)' is the probability that no envelope is a yellow envelope.

Given;

red envelope = 1

blue envelopes = 3

green envelopes = 2

yellow envelopes = 3

Total = 9

Number of non-yellow envelope = 9 -3 = 6

(6 envelope are not yellow)

P(Y)' = P1 × P2 × P3

Since there is no replacement;

P(Y)' = 6/9 × 5/8 × 4/7

P(Y)' = 5/21

From equation 1;

P(Y) = 1 - 5/21

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the probability that at least one envelope is a yellow envelope is 16/21.

8 0
3 years ago
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2 years ago
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