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3 years ago

What’s the answer???(SOMEONE PLEASE HELP)

Mathematics

2 answers:

Pie3 years ago

6 0

Answer:

= 5

Step-by-step explanation:

i = $\sqrt{-1}$

-4 - 9* $\sqrt{-1}$

-4 + 9 * $\sqrt{1}$

-4 + 9 * 1

-4 + 9

= 5

kakasveta [241]3 years ago

5 0

Answer:

$\sqrt{97}$

Step-by-step explanation:

$|a + bi| = \sqrt{a^2 + b^2}$

$|-4 - 9i| = \sqrt{(-4)^2 + (-9)^2}$

$|-4 - 9i| = \sqrt{16 + 81}$

$|-4 - 9i| = \sqrt{97}$

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Graph the function y = x3 + 6x2 + 2x – 11. Based on the graph, what is the largest possible x-value if y = 0? Round your answer

xenn [34]

Answer:

The answer to this question corresponds to computing the largest root of our function. Due to the way in which the question is asked, we can have 2 answers based on the root criteria. Please, read on for the explanation.

Step-by-step explanation:

First, to graph the function we can use any graphing tool available, for this case we chose the free online tool called Desmos calculator. Attached is a graph of the function.

Desmos calculator already shows as the position of the 3 roots. Roots are points on a function whose y-component is zero, meaning the points where the function crosses the x axis.

From the graph we can see that these points are $x= -5.211$ , $x= -1.9$ and $x= 1.111$ .

The ambiguity of the answer comes in choosing the root either with the most positive value, or the root with the largest magnitude. From the way in which the question is asked, we could understand both of these cases.

In case the root with most positive value is asked, then the answer is $x= 1.111$ . However, in case the root with largest magnitude is asked, then the answer is $x= -5.211$ .

As a reference, you can have a look at the following links:

https://en.wikipedia.org/wiki/Magnitude_(mathematics)

https://en.wikipedia.org/wiki/Cubic_function

7 0

3 years ago

Read 2 more answers

A random sample of n measurements is drawn from a binomial population with probability of success . Complete parts a through d b

Dima020 [189]

Complete question :

A random sample of n = 83 measurements is drawn from a binomial population with probability of success 0.4 . Complete parts a through d below. a. Give the mean and standard deviation of the sampling distribution of the sample proportion, . The mean of the sampling distribution of is nothing. The standard deviation of the sampling distribution of is nothing.

Answer:

Mean = 33.2000

Standard deviation = 4.4632

Step-by-step explanation:

Given that :

Sample size (n) = 83

Probability of success (p) = 0.4

q = p' = (1 - p) = 1 - 0.4 = 0.6

The mean of the sampling distribution :

Sample size * probability of success

n * p = 83 * 0.4 = 33.2000

The standard deviation of the sampling distribution :

σ=√(sample size * probability of success * (1 - p))

σ = √n * p * (1 - p)

σ = √(83 * 0.4 * 0.6)

σ = √19.92

σ = 4.46318

σ = 4.4632

4 0

3 years ago

A machine produces a part for the automotive industry. 4% of the parts produced were defective in the past, and we believe that

Mamont248 [21]

Answer:

$n=\frac{0.04(1-0.04)}{(\frac{0.03}{1.64})^2}=114.76$

And rounded up we have that n=115

Step-by-step explanation:

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by $\alpha=1-0.90=0.1$ and $\alpha/2 =0.05$ . And the critical value would be given by:

$z_{\alpha/2}=-1.64, z_{1-\alpha/2}=1.64$

Solution to the problem

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

The proportion of defectives is estimated as: $\hat p=0.04$ . And on this case we have that the margin of error is $ME =\pm 0.03$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.04(1-0.04)}{(\frac{0.03}{1.64})^2}=114.76$

And rounded up we have that n=115

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3 years ago

The height h of an object projected upward from the floor of the Golden Gate Bridge which has an initial height of 220 feet and

8090 [49]

Answer:

7.3

Step-by-step explanation:

time is distance divided by velocity/speed

t = 220/30

t = 7.33333 = 7.3

8 0

3 years ago

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Two supplementary angles are in a ratio of 1:2, What is the measure of the large

ElenaW [278]

The large angle = 120 degrees
Supplementary angles are two angles whose measures add up to 180°
Since we know from the ratio that one angle is twice the size of the other, the angles have to be 60 and 120.

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