solve: 2 - x =-7. please help​

Answer:

  3.06×10^-6

Step-by-step explanation:

0.00000306 = 3.06×0.000001 = 3.06×10^-6

__

Your calculator or spreadsheet can display numbers in scientific notation.

The missing part of the question is highlighted in bold format

The Wall Street Journal reported that the age at first startup for 90% of entrepreneurs was 29 years of age or less and the age at first startup for 10% of entrepreneurs was 30 years of age or more.

Suppose a sample of 200 entrepreneurs will be taken to learn about the most important qualities of entrepreneurs. Show the sampling distribution of p where p is the sample proportion of entrepreneurs whose first startup was at 29 years of age or less. If required, round your answers to four decimal places. np = n(1-p) = E(p) = σ(p) = (b) Suppose a sample of 200 entrepreneurs will be taken to learn about the most important qualities of entrepreneurs. Show the sampling distribution of p where p is now the sample proportion of entrepreneurs whose first startup was at 30 years of age or more. If required, round your answers to four decimal places.

Answer:

(a)

np = 180

n(1-p) = 20

E(p) = p = 0.9

σ(p) = 0.0212

(b)

np =  20

n(1 - p) = 180

E(p) = p = 0.1

σ(p) = 0.0212

Step-by-step explanation:

From the given information:

Let consider p to be the sample proportion of entrepreneurs whose first startup was at 29 years of age or less

So;

Given that :

p = 90%    i.e  p = 0.9

sample size n = 200

Then;

np = 200 × 0.9 = 180

n(1-p) = 200 ( 1 - 0.9)

= 200 (0.1)

= 20

Since np and n(1-p) are > 5 ; let assume that the data follows a normal distribution ;

Then:

The expected value of the sampling distribution of p =  E(p) = p = 0.9

Variance [tex]\sigma^2=\dfrac{p(1-p)}{n}[/tex]

[tex]=\dfrac{0.9(1-0.9)}{200}[/tex]

[tex]=\dfrac{0.9(0.1)}{200}[/tex]

[tex]\mathbf{=4.5*10^{-4}}[/tex]

The standard error of  σ(p) = [tex]\sqrt{\sigma ^2}[/tex]

[tex]\mathbf{= \sqrt{4.5*10^{-4}}}[/tex]

= 0.0212

(b)

Here ;

p is now the sample proportion of entrepreneurs whose first startup was at 30 years of age or more

p = 10%   i.e p = 0.1

sample size n = 200

Then;

np = 200 × 0.1 = 20

n(1 - p) = 200 (1 - 0.1 )  = 180

Since np and n(1-p) are > 5 ; let assume that the data follows a normal distribution ;

Then:

The Expected value of the sampling distribution of p = E(p) = p = 0.1

Variance [tex]\sigma^2=\dfrac{p(1-p)}{n}[/tex]

[tex]=\dfrac{0.1(1-0.1)}{200}[/tex]

[tex]=\dfrac{0.1(0.9)}{200}[/tex]

[tex]\mathbf{=4.5*10^{-4}}[/tex]

The standard error of  σ(p) = [tex]\sqrt{\sigma ^2}[/tex]

[tex]\mathbf{= \sqrt{4.5*10^{-4}}}[/tex]

= 0.0212

Answer: Around 50 times.

Step-by-step explanation:

If the spinner is fair, then each number should have the same probability, that is P = 1/5 = 0.20 for each of the numbers.

Now, we know that we have 5 groups, and each group spins 50 times (so we have a total of 5*50 = 250 spins)

Then we can expect to see the number 3 around:

0.20*150 = 50

Answer:

what's the question?

it's not showing

Answer:

C.

Step-by-step explanation:

To find the perimeter, we'll use the distance formula

Distance Formula = √(x₂-x₁)²+(y₂-y₁)²

Finding Distance of AB

|AB| = √(-2+5)²+(3+1)²

|AB| = √25

|AB| = 5

Now For BC

|BC| = √(6+2)²+(-3-3)²

|BC| = √(8)²+(-6)²

|BC| = √100

|BC| = 10

FOR CA:

|CA| = √(-5-6)²+(-3+1)²

|CA| = √125

Perimeter of Triangle = 10 + 5 + √125

= 15 + √125

Answer:

That can be factored as

(x -1  (1/3) ) * ( x +3) * (x -4/5)

and the zeroes are located at:

x = 1.33333333...   x = -3    and x = .8

Step-by-step explanation:

Answer:

[tex]\boxed{\sf \ \ \ f(x)=(x+3)(5x-4)(3x-4) \ \ \ }[/tex]

Step-by-step explanation:

We need to factorise the following function

[tex]f(x)=15 x^3+13 x^2-80 x+48[/tex]

-3 is a trivial solution, we can notice that f(-3)=0

so we can factorise by (x+3)

let s note a, b and c real and let s write

[tex]f(x)=15 x^3+13 x^2-80 x+48=(x+3)(ax^2+bx+c)[/tex]

[tex](x+3)(ax^2+bx+c) = ax^3+bx^2+cx+3ax^2+3bx+3c=ax^3+(b+3a)x^2+(3b+c)x+3c[/tex]

let s identify...

the terms in [tex]x^3[/tex]

   15 = a

the terms in [tex]x^2[/tex]

   13 = b + 3a

the terms in x

   -80 = 3b+c

the constant terms

   48 = 3c

so it comes, c=48/3=16, a = 15, b = 13-3*15=13-45=-32

so [tex]f(x)=(x+3)(15x^2-32x+16)[/tex]

[tex]\Delta=32^2-4*15*16=64[/tex]

so the roots of [tex](15x^2-32x+16)[/tex] are

[tex]\dfrac{32-8}{15*2}=\dfrac{24}{30}=\dfrac{12}{15}=\dfrac{4}{5}[/tex]

and

[tex]\dfrac{32+8}{15*2}=\dfrac{40}{30}=\dfrac{20}{15}=\dfrac{4}{3}[/tex]

so [tex]f(x)=(x+3)(5x-4)(3x-4)[/tex]

the zeros are -3, 4/5, 4/3

Answer:

Step-by-step explanation:

The  histogram shown in the attached file show that the distribution of differences is approximately normal.

So, we can assume that the distribution is normal.

.

b)

The 95% confidence level for [tex]\mu _D=\mu_1-\mu_2[/tex] is found

[tex]\bar d \pm t_{0.025,11}\frac{S_D}{\sqrt{n} }[/tex]

[tex]=0.666667 \pm 2.201\frac{(2.964436)}{\sqrt{12} } \\\\0.666667 \pm 2.201(0.85576)\\\\=0.666667+ 1.883525474=2.5502\\\\=0.666667- 1.883525474=-1.2169\\\\=(-1.2169,2.5502)[/tex]

since 0  is in the confidence interval. we do not reject the null hypothesis.

No, there is no indication of one design language is available.

Answer:

k = P - m - n

Step-by-step explanation:

The question is asking you to rearrange the equation so that k is alone on one side.

P = k + m + n

P - k = (k + m + n) - k

P - k = m + n

(P - k) - P = m + n - P

-k = m + n - P

-1(-k) = -1 (m + n - P)

k = -m - n + P

The equation is completely simplified so this is your answer.

Answer:

Step-by-step explanation:

total number of digits= 10 (from 0 to 9)

total number of letters = 6 (from A to F)

probability of numbers = 10/(10+6)

= 0.625

this is a case of binomial distribution with fixed number trials

n = 32 and probability p = 0.625

we have to find probability of at least 20 numbers

Use the BINOM.DIST function in Excel to find the cumulative probability.

P(at least 20 numbers) = 1 - BINOMDIST(numbers, trials, probability,true)

setting numbers = 20-1, trials = 32 and probability = 0.625

we get

[tex]P(X \geq 20)=1 - BINOMDIST(20- 1, 32, 0.625, true) \\\\=1 -0.4219 \\\\=0.5781[/tex]

Alternatively,

The probability that there are exactly r letters can be found with binomial probability.

P = nCr pʳ qⁿ⁻ʳ

Given that n = 32, p = 5/8, and q = 3/8, you can use Excel to find each probability from r=20 to r=32, then add them all up.

P = ₃₂C₂₀ (⅝)²⁰ (⅜)³²⁻²⁰ + ₃₂C₂₁ (⅝)²¹ (⅜)³²⁻²¹ + ... + ₃₂C₃₂ (⅝)³² (⅜)³²⁻³²

P = 0.578

Answer:

8x10^13

Step-by-step explanation:

[tex]\text{Solve:}\\\\4(x-2+y)\\\\\text{Use the distributive property:}\\\\4x-8+4y\\\\\text{Since you can't simplify it any further, that'll be your answer}\\\\\boxed{4x-8+4y}[/tex]

Answer:

4x-8+4y

Explanation:

///

Answer:

a) Within 260 grams and 340 grams.

b) 68%

c) 32%

d) 97.35%

Step-by-step explanation:

The empirical rule 68-95-99.7 for bell-shaped distributions tells us that:

a) The data that covers 95% of the organs is within 2 standard deviations (z=±2).

Then we can calculate the bounds as:

[tex]X_1=\mu+z_1\cdot\sigma=300+-2\cdot 20=300+-40=260 \\\\X_2=\mu+z_2\cdot\sigma=300+2\cdot 20=300+40=340[/tex]

b) We have to calculate the number of deviations from the mean (z-score) we have for the values X=280 and X=320.

[tex]z_1=\dfrac{X_1-\mu}{\sigma}=\dfrac{280-300}{20}=\dfrac{-20}{20}=-1\\\\\\z_2=\dfrac{X_2-\mu}{\sigma}=\dfrac{320-300}{20}=\dfrac{20}{20}=1\\\\\\[/tex]

As there are the bounds for one standard devaition, it is expected tht 68% of the data will be within 280 grams and 320 grams.

c) This interval is complementary from the interval in point b, so it is expected that (100-68)%=32% of the organs weighs less than 280 grams or more than 320 grams.

d) We apply the same as point b but with X=240 and X=340 as bounds.

[tex]z_1=\dfrac{X_1-\mu}{\sigma}=\dfrac{240-300}{20}=\dfrac{-60}{20}=-3\\\\\\z_2=\dfrac{X_2-\mu}{\sigma}=\dfrac{340-300}{20}=\dfrac{40}{20}=2\\\\\\[/tex]

The lower bound is 3 deviations under the mean, so it is expected that (99.7/2)=49.85% of the data will be within this value and the mean.

The upper bound is 2 deviations above the mean, so it is expected that (95/2)=47.5% of the data will be within the mean and this value.

Then, within 240 grams and 340 grams will be (49.85+47.5)=97.35% of the organs.

[tex]3x +4y+175x-2y=11[/tex]

[tex]4y-2y+175x+3x=11[/tex]

[tex]2y+178x=11[/tex]

[tex]2y=11-178x[/tex]

[tex]y=\frac{11-178x}{2}[/tex]

[tex]y=-89x+\frac{11}{2}[/tex]

[tex]178x=-2y+11[/tex]

[tex]x=\frac{-2y+11}{178}[/tex]

[tex]x=\frac{-1}{89} y+\frac{11}{178}[/tex]

Answer:

[tex]54.6-3.51\frac{9.2}{\sqrt{48}}=49.94[/tex]    

[tex]54.6+3.51\frac{9.2}{\sqrt{48}}=59.26[/tex]    

The confidence interval is given by (49.94, 59.26)

Step-by-step explanation:

Info given

[tex]\bar X=54.6[/tex] represent the sample mean

[tex]\mu[/tex] population mean (variable of interest)

s=9.2 represent the sample standard deviation

n=48 represent the sample size  

Part a

The confidence interval for the mean is given by the following formula:

[tex]\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}[/tex]   (1)

The degrees of freedom are given by:

[tex]df=n-1=48-1=47[/tex]

The Confidence is 0.999 or 99.9%, and the significance is [tex]\alpha=0.001[/tex] and [tex]\alpha/2 =0.0005[/tex], and the critical value would be [tex]t_{\alpha/2}=3.51[/tex]

And replacing we got:

[tex]54.6-3.51\frac{9.2}{\sqrt{48}}=49.94[/tex]    

[tex]54.6+3.51\frac{9.2}{\sqrt{48}}=59.26[/tex]    

The confidence interval is given by (49.94, 59.26)

Answer:

The answer is 36 hours.

Step-by-step explanation:

As the month increases, the number of hours will be increased by 4 hours.

March = 4 hours

April = 4+4 = 8 hours

May = 8+4 = 12 hours

June = 12+4 = 16 hours

July = 16+4 = 20 hours

August = 20+6 = 24 hours

September = 24+4 = 28 hours

October = 28+4 = 32 hours

November = 32+4 = 36 hours

Answer:

y = 1/-20 (x-2) - 5

Step-by-step explanation:

Focus = (a,b) = (2,-4)

So a = 2, b = -4

Directrix: y = -6

But y = k

So k = -6

Finding Standard Form of Equation for parabola

y = (1/2(b-k))(x-a)²+(1/2)(b+k)

y = (1/2(-4-6))(x-2)+(1/2)(-4-6)

y = (1/2(-10))(x-2)+(1/2)(-10)

y = (1/-20)(x-2)+(-5)

y = 1/-20 (x-2) - 5

Answer:

The perimeter is 26 yards

Step-by-step explanation:

Area of rectangle = A= l x w

1st rectangle = 6 x 5 = 30 yards squared

2nd rectangle= 10 x 3 = 30 yards squared

perimeter of rectangle = 2l+2w= 10 + 10 + 3 + 3= 26

Answer:

  $18,862.91

Step-by-step explanation:

The appropriate formula is ...

 A = P(1 +r/n)^(nt)

where P is the amount invested (14,000), r is the APR (.05), n is the number of times per year interest is compounded (4), and t is the number of years (6).

Filling in the numbers and doing the arithmetic, we get ...

  A = 14,000(1 +.05/4)^(4·6) = 14,000·1.0125^24 ≈ 18,862.91

The balance after 6 years will be $18,862.91.

Answer:

a. mean = 6.96 , standard deviation = 1.71 b. 0.0641

Step-by-step explanation:

Here is the complete question

According to the Behavioural Risk Factor Surveillance System, 58% of all Americans adhere to a sedentary lifestyle (sedentary means does not exercise).

a. If you selected repeated samples of 12 from the U.S. population, what would be the mean number of individuals per sample who do not exercise regularly? What would be the standard deviation?

b. Suppose you select a sample of 12 individuals and find that 10 of them do not exercise regularly. Assuming that the Surveillance System is correct, what is the probability that you would have obtained results as bad or worse than expected?

Solution

a. Since we can only have two types of outcomes, that is, those who exercise and those who do not exercise, the problem follows a binomial distribution.

Since the probability of those who do not exercise, p = 58 % = 0.58,

the mean of the binomial distribution μ = np where n = sample number = 12

So, μ = 12 × 0.58 = 6.96

The standard deviation of a binomial distribution σ = √(npq) where q = probability that people exercise = 1 - p = 1 - 0.58 = 0.42

So, σ = √(12 × 0.58 × 0.42) = √2.9232 = 1.71

b. To find the worst case, we consider the probability that at best, two exercise. Since two exercise, the probability that at best two exercise is ¹²C₂q²p¹⁰ + ¹²C₁qp¹¹ + ¹²C₀q⁰p¹²

= (12 × 11/2)(0.42)²(0.58)¹⁰ + 12(0.42)(0.58)¹¹ + 1 × (0.42)⁰(0.58)¹²

= 0.05 + 0.0126 + 0.00145

= 0.06405

≅ 0.0641

Answer: D

Step-by-step explanation:

The key to finding the line perpendicular to the one given is teh slope. The slope is the opposite reciprocal of the original line.

m=3

perpendicular m=-1/3

Now that we know the slope, we can see which of our answer choices have -1/3 as the slope. We can see D is the only option that has -1/3 for slope.

Answer:

D) y = -1/3x - 4

Step-by-step explanation:

Perpendicular lines have negative reciprocal slopes. This means that since the slope of this line is 3, the slope of a line perpendicular to it would be -1/3 because:

Original slope: 3 (3/1)

Reciprocal (flipped): 1/3

Negative reciprocal (opposite sign): -1/3

The only equation with a slope of -1/3 is D. Therefore, that is the correct answer.

Hope this helps!

Answer:

10/18

=5/9

pls mark as brainliest

Answer:

5/9

Step-by-step explanation:

6 red cards, 8 green cards and 4 blue cards =  18 total cards

not green cards = 6 red+ 4 blue = 10 cards

P( not green) = number not green / total

                      = 10/18

                      =5/9

Answer:

3,325,140 Joules

Step-by-step explanation:

Work done by the pump = Force applied to pump * distance covered by the water.

Since Force = mass * acceleration due to gravity

Force = (density of water * volume of the tank) * acceleration due to gravity

F =ρVg

Workdone = (ρVg )* d

Given ρ = 1000kg/m³, g = 9.8m/s², d = 3m

[tex]V = \pi r^{2}h\\V = \pi (2)^{2} *9\\V = 36 \pi \\V =113.10m^{3}[/tex]

Workdone by the pump = 1000 * 113.10 * 9.8 * 3

Workdone by the pump  = 3,325,140Joules

Answer:

(x,y)=(0,7.333)

Step-by-step explanation:

We are required to:

Maximize p = x + 2y subject to

The graph of the lines are plotted and attached below.

From the graph, the vertices of the feasible region are:

At (0,7.333), p=0+2(7.333)=14.666

At (4,6), p=4+2(6)=4+12=16

At (0,0), p=0

At (7,0), p=7+2(0)=7

Since 14.666 is the highest, the maximum point of the feasible region is (0,7.333).

At x=0 and y=7.333, the function p is maximized.

Answer:

9x + 4x^2 - 5y

Step-by-step explanation:

It is given in the question that the length of a rectangular field is represented by the expression 14x - 3x^2 + 2y and width of the field by 5x - 7x^2 + 7y

Now we have to tell how much greater is the length of the field than the width.

That means length is greater than width and we have to subtract width from length.

Length - width = (14x - 3x^2 + 2y) - (5x - 7x^2+ 7y)

                        = 14x - 5x - 3x^2 + 7x^2 + 2y - 7y

                        = 9x + 4x^2 - 5y

Therefore expression which represents the difference between length and width of the field will be (9x + 4x^2 - 5y)

By 9x+4x²-5y length is greater than the width of a rectangle.

To subtract an algebraic expression from another, we should change the signs (from '+' to '-' or from '-' to '+') of all the terms of the expression which is to be subtracted and then the two expressions are added.

Given that, the length of rectangle is 14x-3x²+2y and width of a rectangle is 5x-7x²+7y.

To find how much greater is the length of the field than the width we need to subtract the width from the length, we get

14x-3x²+2y-(5x-7x²+7y)

= 14x-3x²+2y-5x+7x²-7y

= 9x+4x²-5y

Therefore, option A is the correct answer.

To learn more about the subtraction of expression visit:

https://brainly.com/question/12959016.

#SPJ7

"Your question is incomplete, probably the complete question/missing part is:"

The length of a rectangular field is represented by the expression14x-3x^2+2y. The width of the field is represented by the expression 5x-7x^2+7y. How much greater is the length of the field than the width?

A) 9x+4x^2-5y

B)9x-10x^2-5y

C)19x+4x^2+9y

D) 19x-10x^2+9y

Answer:

  61°

Step-by-step explanation:

The inscribed angle has half the measure of the central angle subtending the same arc (AC).

  ∠ADC = (∠ABC)/2 = 122°/2

  ∠ADC = 61°

Answer:

[tex]P(X>12)=P(\frac{X-\mu}{\sigma}>\frac{12-\mu}{\sigma})=P(Z>\frac{12-14}{3})=P(z>-0.67)[/tex]

And we can find this probability with the complement rule and with the normal standard table we got:

[tex]P(z>-0.67)=1-P(z<-0.67)=1-0.2514=0.7486 [/tex]

Step-by-step explanation:

Let X the random variable that represent the components whose lenghts of a population, and for this case we know the distribution for X is given by:

[tex]X \sim N(14,\sqrt{9}=3)[/tex]  

Where [tex]\mu=14[/tex] and [tex]\sigma=3[/tex]

We are interested on this probability

[tex]P(X>12)[/tex]

And we can use the z score given by:

[tex]z=\frac{x-\mu}{\sigma}[/tex]

Using this formula we got:

[tex]P(X>12)=P(\frac{X-\mu}{\sigma}>\frac{12-\mu}{\sigma})=P(Z>\frac{12-14}{3})=P(z>-0.67)[/tex]

And we can find this probability with the complement rule and with the normal standard table we got:

[tex]P(z>-0.67)=1-P(z<-0.67)=1-0.2514=0.7486 [/tex]

Answer:

The desired probability is P(X≥12), so subtract from 1 to get P(X≥12)=1−0.2525=0.7475.

Step-by-step explanation:

Answer:

16

Step-by-step explanation:

[tex]16x^0= \\\\16(-3)^0= \\\\16(1)= \\\\16[/tex]

Hope this helps!

x = -3

[tex]A = 16.(-3)^{0} \\ x^{0} = 1\\A = 16.1 \\A = 16[/tex]

Remember that [tex]x^{0} = 1[/tex] ∀ [tex]x[/tex]

Answer:

A is a knave

B is a knight

Step-by-step explanation:

If A is telling the truth, then both are knights and B cannot be lying. However, since B claims that A is a knave, they can't be both knights, and there is no possible way that A is a knight.

If A is knave and thus is lying, they aren't both knights. Since B claims A is a knave, his statement can be true and thus B can be knight and A will be knave.

There different kinds of puzzle. The option that is correct about the puzzle is option A which states that A is a knave and B is a knight.

It is known as a logic puzzles that  took place on an island with two kinds of people. It is a puzzle by American mathematician and musician called Raymond Smullyan  in his book written in 1978.

Note that knave often lie and thus A may be lying when He said he was a knight Since B claims A is a knave, his statement can be said to be true and thus B can be regarded as knight.

See full question below

The logician Raymond Smullyan describes an island containing two types of people: knights who always tell the truth and knaves who always lie. You are visiting the island and have the following encounters with natives. (a) Two natives A and B address you as follows. A says: Both of us are knights. B says: A is a knave.

What are A and B?

A. A is a knave and B is a knight.

B. A is a knave and A is a knight.

C. Both A and B are knights.

D. Both A and B are knaves.

Learn more about knight from

https://brainly.com/question/11363810

Answer:

The rule of reflection over y-axis is  (x,y)→(-x ,y)

M(-5,4) →M¹( 5 , 4)

N(-3,2) →N¹(3 ,2)

L(-6,2) →L¹( 6,2)

Step-by-step explanation:

Explanation:-

Type of transformation                     change to co-ordinate point

Reflection over x-axis                          (x,y)→(x ,-y)

Reflection over y-axis                          (x,y)→(-x ,y)

Given co-ordinate is M(-5,4)

The reflection over y-axis is  (x,y)→(-x ,y)

M(-5,4) →( 5 , 4)

N(-3,2) →(3 ,2)

L(-6,2) →( 6,2)

Answer: the answer is a

Step-by-step explanation:

Hope that helped

Answer:

Step-by-step explanation:

The question is incomplete. The complete question is:

Ten rugby balls are randomly selected from the production line to see if their shape is correct. Over time, the company has found that 89.4% of all their rugby balls have the correct shape. If exactly 6 of the 10 have the right shape, should the company stop the production line?

1)Yes as the probability of six having the correct shape is not unusual

2)NO. as the probability of six having the correct shape is unusual

3)Yes as the probability of six having the correct shape is unusual

4) No. as the probability of six having the correct shape is not unusual

Solution:

If exactly 6 of the 10 have the right shape, it means that the probability of success for the sample is

6/10 = 0.6

Expressing the probability in terms if percentage, it becomes

0.6 × 100 = 60%

Over time, the company has found that 89.4% of all their rugby balls have the correct shape. It means that the probability of success for the population is 89.4%

Comparing both probabilities, the probability of only 6 having the right shape is unusual. Therefore, the correct option is

3)Yes as the probability of six having the correct shape is unusual

Answer:

The numerator would be [tex]4x+6[/tex]

Step-by-step explanation:

[tex]\frac{x}{x^{2}+3x+2 } +\frac{3}{x+1}[/tex]

= [tex]\frac{4x^{2}+10x+6 }{x^3+4x+5x+2}[/tex]

= [tex]\frac{2(2x+3)(x+1)}{(x+1)(x+1)(x+2)}[/tex]

= [tex]\frac{4x+6}{x^2+3x+2}[/tex]

the numerator is always the top number/value of a fraction thus it being [tex]4x+6[/tex]

brainliest pls