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3 years ago

What is the value of f(-2) in the function represented by f(x) = -4x2 – 3x + 2

Mathematics

2 answers:

faust18 [17]3 years ago

6 0

Answer:

Step-by-step explanation:

-4(-2)^2 -3(-2) +2

-4(4) +6+2

-16+8

-8

Kitty [74]3 years ago

6 0

Answer:

Step-by-step explanation:

(-2)^2 = 4

(-4)4 = -16

-3(-2) = 6

-16+6 = -10

-10+2 = -8

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What is 54/12 in a mixed number?

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12 can go into 54 only 4 times because 4•12 is 48. Now 56-48=6 so this is the remainder 6/12 wish can be simplified to 1/2 so your answer is 4 1/2 or 4.5. Hope this helps <333

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3 years ago

Solve using substitution<br>x-2y =2<br>3x+4y=3

lorasvet [3.4K]

Answer:

7/5, y = -3/10

Step-by-step explanation:

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3 years ago

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The scatterplot shows the time it takes for a new hot plate to boil various amounts of water, and one lab group’s attempt at a l

Alinara [238K]

Answer:

The correct option is;

The line of best fit is not reasonable because it has more points below it than above it.

Step-by-step explanation:

Here we note that there are a total of seven points in the scatter plot and there are five of the points below the line of best fit and just two above the line.

Of the five points below the line of best fit, four are just about touching the underside of the line while one of the two points above the line is just about touching the line.

The proper positioning of the line can be reviewed, therefore, with a line drawn through the four points presently touching the underside of the line of best fit.

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3 years ago

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Need HELP ASAP/ Cant get this wrong!!

Pavlova-9 [17]

Answer:

Step-by-step explanation:

It's most probably B

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3 years ago

Spaulding is the leading maker for basketballs in the US. Spaulding prides itself on the quality that its basketballs have the r

Vesna [10]

Answer:

0 < 0.05, which means that we reject the null hypothesis, meaning that the air pressure of the balls is different of the target value of 7.9.

Step-by-step explanation:

The air pressure of a particular ball has a target value of 7.9 PSI.

This means that the null hypothesis is:

$H_{0}: \mu = 7.9$

The alternate hypothesis is:

$H_{a}: \mu \neq 7.9$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

The hypothesis tested means that $\mu = 7.9$

Suppose the basketballs have a normal distribution with a standard deviation of 0.20 PSI.

This means that $\sigma = 0.2$

When a shipment of basketballs arrive, the consumer takes a sample of 21 from the shipment and measures their PSI to see if it meets the target value, and finds the mean to be 7.3 PSI.

This means that $X = 7.3, n = 21$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{7.3 - 7.9}{\frac{0.2}{\sqrt{21}}}$

$z = -13.74$

pvalue:

We are testing that the mean pressure is different than the target value of 7.9, and since the test statistic is negative, the pvalue is 2 multiplied by the pvalue of z = -13.74, which we find looking at the z-table.

$z = -13.74$ has a pvalue of 0.

2*0 = 0

0 < 0.05, which means that we reject the null hypothesis, meaning that the air pressure of the balls is different of the target value of 7.9.

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2 years ago