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4 years ago

4 × (8 – 3) = (4 × 8) – ( × 3)

2 answers:

8 0

In this problem there might be a number that you need to add before the "( x 3)" then your answer will be 20 = 32 - 12 = 20

Naddik [55]4 years ago

8 0

It should be 4? Both sides have to be equal. The answer to the 4 x (8-3) is 20 because 8-3 = 5 and 4 x 5 = 20. On the other side 4x8 = 32. The missing number in the next set of paranthesis needs to equal the number that will subtract from 32 to make the answer 20... the parathensis should be 4x3 because it = 12.

4 x (8-3) = (4x8) - (4x3)
4 x 5 = 32 - 12
20 = 20

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Solve y = x2 +7 for x.

FromTheMoon [43]

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Your friend is about to begin an introductory chemistry course at his university. The course has collected data from students on

Minchanka [31]

Answer:

The percentage of students sudy 34 hours or more is 0.62%

Step-by-step explanation:

The Normal Distribution

The bell curve or normal distribution is frequently used to model the probability of natural random events. The normal distribution $N(\mu,\sigma)$ is characterized by two parameters:

$\mu$ is the mean value

$\sigma$ is the standard deviation

The study times in hours for the final exam is modeled as a normal distribution N(24,4). We are required to find the percentage of students study 34 hours or more, or P(X>34).

The values for the cumulative probability are given by tables or digital means like Excel where we can get the left-tail or P(X<Xo). To compute the right-tail or P(X>Xo) we use this relation

$P(X>Xo) =1-P(X$

The Excel formula to find the left-tail cumulative probability is called

NORM.DIST(x,mean,standard_dev,cumulative)

To solve the question, we used:

NORM.DIST(34,24,4,TRUE)=0.9938

Thus:

$P(X>34) =1-P(X$

The percentage of students study 34 hours or more is 0.62%

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3 years ago