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mrs_skeptik [129]

3 years ago

15

HELP............................................................................................................................

......................................................................!?

1 answer:

weqwewe [10]3 years ago

7 0

Answer:

More than half I think its based off of a 1-10% scale

Step-by-step explanation:

it's greater than 5%

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Two lines intersect as shown.<br> (2x+20) •<br> 609<br><br> Which is the value of x ?

Rom4ik [11]

Answer:

$2x + 20 = 60 \\ 2x = 60 - 20 \\ 2x = 40 \\ x = \frac{40}{2} \\ x = 20$

4 0

3 years ago

Find a compound proposition involving the propositional variables p, q, and r that is true when exactly two of p, q, and r are t

VLD [36.1K]

Answer:

Consider the proposition C=(p∧q∧¬r)∨(p∧¬q∧r)∨(¬p∧q∧r)

Step-by-step explanation:

This compound proposition C uses the outer disjunction (∨) then the proposition is true if and only if one of the three propositions (p∧q∧¬r),(p∧¬q∧r),(¬p∧q∧r) is true.

First, it is impossible that two or three of these propositions are simultaneously true. For example, if (p∧q∧¬r) and (p∧¬q∧r) are both true, then ¬r is true (from the first conjuntion) and r is true (from the second one), a contradiction. All the other possibilities can be discarded reasoning in the same way.

Since these propositions are mutually excluyent, C is true if and only if exactly one of the three propositions is true (and false otherwise). This can only happen if exactly two of p,q, and r are true and the other one is false. For example, (p∧q∧¬r) is true when p and q are true, and r is false.

8 0

4 years ago

A high-tech company wants to estimate the mean number of years of college education its employees have completed. A sample of 15

valentinak56 [21]

Answer:

$4 - 2.14 \frac{0.7}{\sqrt{15}}=3.61$

$4 + 2.14 \frac{0.7}{\sqrt{15}}=4.39$

The 95% confidence interval is given by (3.61;4.39)

Step-by-step explanation:

Notation and definitions

n=15 represent the sample size

$\bar X=4$ represent the sample mean

$s=0.7$ represent the sample standard deviation

m represent the margin of error

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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".

Calculate the critical value tc

In order to find the critical value is important to mention that we don't know about the population standard deviation, so on this case we need to use the t distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . The degrees of freedom are given by:

$df=n-1=15-1=14$

We can find the critical values in excel using the following formulas:

"=T.INV(0.025,14)" for $t_{\alpha/2}=-2.14$

"=T.INV(1-0.025,14)" for $t_{1-\alpha/2}=2.14$

The critical value $tc=\pm 2.14$

Calculate the margin of error (m)

The margin of error for the sample mean is given by this formula:

$m=t_c \frac{s}{\sqrt{n}}$

$m=2.14 \frac{0.7}{\sqrt{15}}=0.387$

Calculate the confidence interval

The interval for the mean is given by this formula:

$\bar X \pm t_{c} \frac{s}{\sqrt{n}}$

And calculating the limits we got:

$4 - 2.14 \frac{0.7}{\sqrt{15}}=3.61$

$4 + 2.14 \frac{0.7}{\sqrt{15}}=4.39$

The 95% confidence interval is given by (3.61;4.39)

4 0

3 years ago

How am I supposed to figure this out if csc Theta(0) has a radical number on the top?

Harman [31]

$\bf csc(\theta)=\cfrac{hypotenuse}{opposite}\implies csc(\theta)=\cfrac{\sqrt{7}}{2}\cfrac{\leftarrow hypotenuse=c}{\leftarrow opposite=b}\\\\
-----------------------------\\\\
\textit{so hmm using the pythagorean theorem, we can say that}\\\\
c^2=a^2+b^2\implies \pm \sqrt{c^2-b^2}=a\qquad 
\begin{cases}
c=hypotenuse\\
b=opposite\\
a=adjacent
\end{cases}\\\\
\textit{we'll assume is the + of the root, since you're not}\\
\textit{given further info on it, that means the I quadrant}\\\\
$

$\bf -----------------------------\\\\
cos(\theta)=\cfrac{a}{c}\qquad sec(\theta)=\cfrac{c}{a}\qquad tan(\theta)=\cfrac{b}{a}\qquad cot(\theta)\cfrac{a}{b}
$

so just find the "adjacent" side, using the pythagorean theorem, and even though the square root can give you +/-, use the positive one, assuming the angle is in the 1st quadrant

keeping in mind, that the 2nd quadrant is feasible as well, since the opposite side of +2 can also be in the 2nd quadrant

but anyhow, use the I quadrant

7 0

3 years ago

What number increased by 7 equals two times the number?<br><br><br> 6<br> 7<br> 8<br> 9<br> 11

Julli [10]

Answer:

7

Step-by-step explanation:

7 plus 7 equals 14, which is two times 7

8 0

3 years ago

Read 2 more answers