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3 years ago

F(x) = 4x2 – 7x + 7 Find f (7) Please help me

Mathematics

1 answer:

lorasvet [3.4K]3 years ago

8 0

Answer:

f(7)=140

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 years ago

Let f(x) = 2x, g(x) = 2x^2 – x, and h(x) = 3x. Lola finds the composition [f o g o h](x) as shown below. What error did Lola mak

Kisachek [45]

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4 years ago

The list shows the numbers of each type of pie baked at a bakery today.

Alenkasestr [34]

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3 years ago

X divided by 4=28 solve x

gtnhenbr [62]

Answer:

112

Step-by-step explanation:

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4 years ago

Read 2 more answers

. The National Sleep Foundation surveyed representative samples of adults in six different countries to ask questions about slee

scoundrel [369]

Answer:

Yes the conclusion in the question is a reasonable conclusion

Step-by-step explanation:

From the question we are told that

The sample size is $n_1 = n_2 = n = 250$

The sample mean for USA is $\= x_1 = 391 \ minutes$

The sample mean for Mexico is $\= x_2 = 426 \ minutes$

The sample standard deviation for USA is $s_1 = 25 \ minutes$

The sample standard deviation for Mexico is $s_2 = 49 \ minutes$

The null hypothesis is $H_o : \mu_1 = \mu_2$

The alternative hypothesis is $H_a : \mu_1 < \mu_2$

Generally the test statistics is mathematically represented as

$z = \frac{\= x_1 - \= x_2 }{ \sqrt{ \frac{s_1^2}{n_1} + \frac{s_2^2}{n_2 } } }$

=> $z = \frac{ 391 - 426 }{ \sqrt{ \frac{25^2}{250} + \frac{49^2}{250} } }$

=> $z = -10$

From the z table the area under the normal curve to the left corresponding to -10 is

$p-value = P(Z < -10 ) = 0.00$

Generally from the value obtained we see that

The p-value is < $\alpha$ hence

The decision rule is

Reject the null hypothesis

The conclusion is

The is sufficient evidence to conclude that adults in the United States get less sleep on work nights than adults in Mexico

Hence the conclusion in the question is a reasonable conclusion

6 0

3 years ago