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slava [35]
3 years ago
8

2x^2 + 3x - 12 when x = 5 help pls

Mathematics
2 answers:
cluponka [151]3 years ago
5 0

\huge\textsf{Hey there!}

\mathsf{2x^2 + 3x - 12}

\mathsf{= 2(5)^2 + 3(5) - 12}

\mathsf{5^2}

\mathsf{= 5 \times 5}

\mathsf{\bf = 25}

\mathsf{2(25) + 3(5) - 12}

\mathsf{2(25)}

\mathsf{= \bf 50}

\mathsf{3(5)}

\mathsf{= \bf 15}

\mathsf{= 50 + 15 -  12}

\mathsf{50 + 15}

\mathsf{= \bf 65}

65 - 12

\mathsf{= \bf 53}

\boxed{\boxed{\huge\textsf{Answer: \bf 53}}}\huge\checkmark

\large\textsf{Good luck on your assignment and enjoy your day!}

~\frak{Amphitrite1040:)}

Vesna [10]3 years ago
3 0
2x^2 + 3(5)-12
2x^2+ 15+-12

combine like terms

2x^2+15+-12
(2x^2)+(15+-12)

Answer:
2x^2 + 3
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We also need to subtract the areas of the two doors and the 4 windows.

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Then the total area that will be painted is:

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area = 2*( 240ft²) + 2*(360ft²) + 600ft² - 2*(21ft²) - 4*(12ft²)

area = 1,710 ft²

We know that we need two coats of paint to cover that area, and the cost per square foot of paint is $0.25, then the total cost is:

C = $0.25*2*(1,710) = $855

The cost to paint the walls and the ceiling is $855

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Answer:

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z = \frac{79-65}{12}=1.167

As we can see the z score for Ferdinad is higher than the z score for Emilia so on this case we can conclude that Ferdinand was better compared with his group of reference.

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

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Let X the random variable that represent the scores of a test, and we know that

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The z score formula is given by:

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Since Emilia made 83 points we can find the z score like this:

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Ferdinand case

Let X the random variable that represent the scores of a test, and we know that

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The z score formula is given by:

z=\frac{x-\mu}{\sigma}

Since Ferdinand made 79 points we can find the z score like this:

z = \frac{79-65}{12}=1.167

As we can see the z score for Ferdinad is higher than the z score for Emilia so on this case we can conclude that Ferdinand was better compared with his group of reference.

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