2 years ago

(x + 3 ) * (x-2) giúp mình giải bài này với

Mathematics

1 answer:

yarga [219]2 years ago

7 0

Answer:

${x}^{2} + x - 6 \\$

Step-by-step explanation:

$(x + 3)(x - 2) \\ x(x - 2) + 3(x - 2) \\ {x}^{2} - 2x + 3x - 6 \\ {x}^{2} + x - 6 \\$

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Answer:

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Suppose that 45% of people have dogs. If two people are randomly chosen, what is the probability that they both have a dog

mylen [45]

Answer:

$P(Dogs) = 0.2025$

Step-by-step explanation:

Given

$Proportion, p = 45\%$

Required

Probability of two people having dog

First, we have to convert the given parameter to decimal

$p = \frac{45}{100}$

$p = 0.45$

Let P(Dogs) represent the required probability;

This is calculated as thus;

P(Dogs) = Probability of first person having a dog * Probability of second person having a dog

$P(Dogs) = p * p$

$P(Dogs) = 0.45 * 0.45$

$P(Dogs) = 0.45^2$

$P(Dogs) = 0.2025$

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Step-by-step explanation:

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