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Anna35 [415]
3 years ago
5

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be consid

ered an indication that a chemical reaction or chemical change has taken place?
A) Solid melts.
B) Heat is given off.
C) Substance dissolves
D) Substance changes shape.
Physics
1 answer:
mixer [17]3 years ago
4 0
The answer would be B, heat is given off. Steam, bubbling, and fizzing can also indicate that a chemical change is occurring.  
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(b) Probability = 0.2646

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The question illustrates binomial probability and will be solved using the following binomial expansion;

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Probability = 4L^3W + 6L^2W^2 + 4LW^3 + W^4

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Probability = 0.7599

<em>Hence, the probability of her winning at least one is 0.7599</em>

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We look at the above and we list out the terms where the powers of W is exactly 2

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Substitute value for W and L

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<em>Hence, the probability of her winning exactly two is 0.2646</em>

6 0
2 years ago
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