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3 years ago

Divide a^2+7a+12/a+4

Mathematics

2 answers:

Ulleksa [173]3 years ago

5 0

$a^2+7a+12=a^2+3a+4a+12=a(a+3)+4(a+3)=(a+3)(a+4)$

$therefore:\\\\\frac{a^2+7a+12}{a+4}=\frac{(a+3)(a+4)}{a+4}=a+3$

tankabanditka [31]3 years ago

5 0

You need to factor your numerator, which will give you (a + 3)(a + 4), and then divide by a + 4. You will that a + 4 cancel out in the numerator and the denominator. You are left with a + 3, which is your answer.

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Answer:

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Step-by-step explanation:

For each adult smartphone users, there are only two possible outcomes. Either they use the phone in meetings or classes, or they do not. The probability of an adult using the phone in these settings is independent of any other adult. This means that we use the binomial probability distribution to solve this question.

Binomial probability distribution

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In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

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And p is the probability of X happening.

58% use them in meetings or classes

This means that $p = 0.58$

20 adult smartphone users are randomly selected

This means that $n = 20$

Find the probability that exactly 13 of them use their smartphones in meetings or classes.

This is $P(X = 13)$ . So

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