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3 years ago

Can I get some help

Mathematics

1 answer:

ra1l [238]3 years ago

5 0

Answer:

The answer to your question is below

Step-by-step explanation:

The answers for 1, 3 and 4 are given in decimals and roots.

1) $\sqrt{2^{2} - 4(3)(-6)}$

$\sqrt{4 + 72}$

$\sqrt{76}$

$2\sqrt{19} = 8.71$

2) $\sqrt{1^{2} -4(1)(-6)}$

$\sqrt{1 + 24}$

$\sqrt{25}$

3) $\sqrt{1^{2} - 4(1)(-11)}$

$\sqrt{1 + 44}$

$\sqrt{45}$

$3\sqrt{5} = 6.7$

4) $\sqrt{8^{2} -4(5)(2)}$

$\sqrt{64 - 40}$

$\sqrt{24}$

$2\sqrt{6} = 4.89$

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Amber, Bernie, and Carlos are working on a problem together. Their goal is to correctly apply the difference of cubes formula to

NeX [460]

Answer: Carlos is correct

Step-by-step explanation:

2x^5-250x^2

The first step is to factorize out 2x^2

2x^2(x^3-125)

This can be rewritten as

2x^2(x^3-5^3),

Recall, difference if cube (a^3-b^3)

= (a-b)(a^2 +ab + b^2)

from our equation,

a= x

b = 5.

So the difference of cubes will be

2x^2[(x-5) (x^2 + 5x + 5^2)]

=2x^2[(x-5) (x^2 + 5x + 25)]

Carlos followed these steps. So he is correct. Carlos is correct because he correctly factored the GCF, identified a and b, and applied the difference of cubes method.

Amber is incorrect because 125 is equal to b3, not b.

Bernie is incorrect because x2 is not the GCF of the polynomial. The GCF is 2x^2.

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3 years ago

A total of 50,000 contestants are chosen for a survey. A

ankoles [38]

I am pretty sure it is linear decrease,

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3 years ago

g A visit to a hospital emergency room for something as simple as a sore throat could have a mean cost of $328. Assume that this

Rasek [7]

Answer:

The cut-off dollar amount is $328.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean cost of $328, standard deviation of $82.

This means that $\mu = 328, \sigma = 82$