Prove that if AB= 0and A is invertible then B= 0

Answer:

a) The probability is the number of favorable outcomes divided by the number of possible outcomes. There are 52 cards in a deck.

Step-by-step explanation

hope this helps.

Answer:

If [tex]h(x) = x^2 + 2x + 10[/tex] then [tex](x+1-3i)*(x+1+3i)[/tex].

If [tex]h(x) = x^2 - 2x + 10[/tex] then [tex](x-1-3i)*(x-1+3i)[/tex].

Step-by-step explanation:

In order to write the polynomial as the product of linear factors, we need to find the roots of the polynomial. A quadratic equation is defined as:

[tex]ax^2+bx+c[/tex]

Because the given polynomial expression is a quadratic equation, we can use the following equations for calculating the roots:

[tex]x1=(-b/2a)+\sqrt{b^2-4ac}/2a[/tex]

[tex]x1=(-b/2a)-\sqrt{b^2-4ac}/2a[/tex]

Since the second term sign is not given, then we can write the expression as:

[tex]x^2+s2x+10[/tex], in which a=1, b=s2 where 's' represents a sign (- or +), and c=10.

Using the equation for finding the roots we obtain:

[tex]x1=(-sb/2a)+\sqrt{b^2-4ac}/2a[/tex]

[tex]x1=(-s2/2*1)+\sqrt{2^2-4*1*10}/(2*1)[/tex]; notice that [tex](sb)^{2} = 2^{2}[/tex]

[tex]x1=(-s1)+\sqrt{-36}/2[/tex]

[tex]x1=-(s1)+6i/2[/tex]

[tex]x1=-(s1)+3i[/tex]

[tex]x2=(-sb/2a)-\sqrt{b^2-4ac}/2a[/tex]

[tex]x2=(-s2/2*1)-\sqrt{2^2-4*1*10}/(2*1)[/tex]; notice that (s2)²=2^2

[tex]x2=(-s1)-\sqrt{-36}/2[/tex]

[tex]x2=-(s1)-6i/2[/tex]

[tex]x2=-(s1)-3i[/tex]

If we consider 's' as possitive (+) the roots are:

[tex]x1=-1+3i[/tex] and [tex]x2=-1-3i[/tex]

Whereas if we consider 's' as negative (-) the roots are:

[tex]x1=1+3i[/tex] and [tex]x2=1-3i[/tex]

The above means that if the equation is [tex]h(x) = x^2 + 2x + 10[/tex], then we can express the polynomial as: [tex](x+1-3i)*(x+1+3i)[/tex].

But, if the equation is [tex]h(x) = x^2 - 2x + 10[/tex], then we can express the polynomial as: [tex](x-1-3i)*(x-1+3i)[/tex].

Answer: 99.73%

Step-by-step explanation:

Given : Mean : [tex]\mu=100[/tex]

Standard deviation : [tex]\sigma=2[/tex]

Let X be the random variable that represents the data values.

Formula for Z-score :  [tex]z=\dfrac{X-\mu}{\sigma}[/tex]

For x=94, we have

[tex]z=\dfrac{94-100}{2}=-3[/tex]

For x=106, we have

[tex]z=\dfrac{106-100}{2}=3[/tex]

The probability that the samples are between 94 and 106:-

[tex]P(-3<x<3)=1-2P(z<-3)\\\\=1-2(0.0013499)=0.9973002\approx0.9973=99.73\%[/tex]

Hence, the percent of the samples are expected to be between 94 and 106 = 99.73%

Approximately 95% of the samples are expected to be between 94 and 106.

The percentage of samples that are expected to be between 94 and 106 can be determined using the empirical rule, also known as the 68-95-99.7 rule. According to this rule, approximately 68% of the samples will fall within one standard deviation of the mean, and approximately 95% of the samples will fall within two standard deviations of the mean.

In this case, the control limits are 94 and 106, which are one standard deviation below and above the mean, respectively. Therefore, 95% of the samples are expected to be between 94 and 106.

Note that this rule applies to data that follow a bell-shaped, symmetric distribution, which is assumed to be the case for this set of sample measurements.

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Answer: 0.5

Step-by-step explanation:

We know that the mean and variance of a binomial distribution with probability of success p is given by :-

[tex]\text{Mean}:\mu=np\\\\\text{Variance}:\sigma^2=np(1-p)[/tex], where n is the total number of trials .

Given : A given binomial distribution has

[tex]\text{Mean}:\mu=np=4.......(1)\\\\\text{Variance}:\sigma^2=np(1-p)=2............(2)[/tex]

Now we substitute , the value of np from (1) in (2), we get

[tex]4(1-p)=2\\\\\Rightarrow\ 1-p=\dfrac{2}{4}\\\\\Rightarrow\ p=1-\dfrac{1}{2}\\\\\Rightarrow\ p=\dfrac{1}{2}=0.5[/tex]

Hence, the probability of success (p) = 0.5

Answer:

Step-by-step explanation:

[tex]y''-4y=cosx[/tex]

The auxialary equation and solutions are as follows:

[tex]m^2-4=0\\m=2,-2[/tex]

General solution is

[tex]y=Ae^{2x} +Be^{-2x}[/tex]

Right side =cosx

Particular Integral

= [tex]\frac{cosx}{-1-4} =\frac{-cosx}{5}[/tex]

Hence full solution is

Answer:

Elga is 37 years old.

Step-by-step explanation:

Let 'x' be the age of elga.

Alvin's age is: x + 15

Given that the sum of their ages is 89, we have that:

x + 15 + x = 89

2x = 89 - 15

2x = 74

x = 74/2 = 37

Elga is 37 years old.

Answer:

Elga is 37 years old.

Step-by-step explanation:

Alvin (A) is 15 years older than Elga (E).

The sum their anges (A and E) is 89.

So the system we have is:

A=15+E

A+E=89

We are going to input 15+E for A in A+E=89 since first equation says A+15+E.

A+E=89 with A=15+E

(15+E)+E=89

15+E+E=89

15+2E=89

Subtract 15 on both sides:

2E=89-15

2E=74

Divide both sides by 2:

2E/2=74/2

E=74/2

E=37

Elga is 37 years old.

A=15+E=15+37=52 so Alvin is 52 yeard old.

52+37=89.

and

52=15+37.

Answer: Inductive argument.

Step-by-step explanation:

The arguments are of two types : Inductive  (uses pattern or signs to get a conclusion ) and deductive (Uses general facts or defines or theory to decide any conclusion)

The given argument : The road map indicates that it is 10 miles from Vacaville to Fairfield. From the information on the road map, it follows that Vacaville and Fairfield really are 10 miles apart.

The given argument is the argument that is based on signs (maps are signs) which comes under inductive arguments.

Thus, the given argument is an inductive argument.

The argument which concludes that Vacaville and Fairfield are 10 miles apart based on the information from a road map is an example of a deductive argument, specifically, a syllogism.

The argument you're describing here falls under the category of a deductive argument. Specifically, it is an example of a syllogism, which is a form of deductive reasoning consisting of two premises and a conclusion. The premises in this case are 'The map says there are 10 miles between Vacaville and Fairfield' and 'The map is correct'. Therefore, the conclusion is 'There are 10 miles between Vacaville and Fairfield'.

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Answer:

2 possible towers

Step-by-step explanation:

2 possible towers

Step-by-step explanation:

The height of the tower required is 10 cm, and that height may be obtained by 'x' number of blocks A and 'y' number of blocks, knowing its respective height, so 'x' and 'y' must accomplish the equation:

[tex] 10 = 2x + 3y [/ tex]

The maximum value for 'x' is 5; a higher value will give a higher than 10 cm height as a result. So, the possible answers for 'x' are: (0,1,2,3,4,5). Note that both 'x' and 'y' values ​​must be integers, and the only numbers that satisfy that condition are (x = 2, y = 2) and (x = 5, y = 0). The other options for 'x' will give a noninteger value for 'y' because of the equation above.

So, there are just two options.

Answer:

Step-by-step explanation:

If each day equal chance then p = Prob that a person is borne on a particular day = 1/365

Each person is independent of the other and there are two outcomes either borne in July or not

p = prob for one person not borne in July = (365-31)/365 = 334/365

a)Hence prob that no one from n people borne in July = [tex](\frac{334}{365} )^n[/tex]

b) p = prob of any one borne in July or Aug = [tex]\frac{(31+31) }{365} =\frac{62}{365}[/tex]=0.1698

X- no of people borne in July or Aug

n =15

P(X>=2) =[tex]15C2 (0.1698)^2*(1-0.1698)^{13} +15C3 (0.1698)^3*(1-0.1698)^{12} +...+15C15 (0.1698)^{15}[/tex]

=0.7505

For any equation,

[tex]a_ny^(n)+\dots+a_1y'+a_0y=0[/tex]

assume solution of a form, [tex]e^{yt}[/tex]

Which leads to,

[tex](e^{yt})'''-(e^{yt})''+4(e^{yt})'-4e^{yt}=0[/tex]

Simplify to,

[tex]e^{yt}(y^3-y^2+4y-4)=0[/tex]

Then find solutions,

[tex]\underline{y_1=1}, \underline{y_2=2i}, \underline{y_3=-2i}[/tex]

For non repeated real root y, we have a form of,

[tex]y_1=c_1e^t[/tex]

Following up,

For two non repeated complex roots [tex]y_2\neq y_3[/tex] where,

[tex]y_2=a+bi[/tex]

and,

[tex]y_3=a-bi[/tex]

the general solution has a form of,

[tex]y=e^{at}(c_2\cos(bt)+c_3\sin(bt))[/tex]

Or in this case,

[tex]y=e^0(c_2\cos(2t)+c_3\sin(2t))[/tex]

Now we just refine and get,

[tex]\boxed{y=c_1e^t+c_2\cos(2t)+c_3\sin(2t)}[/tex]

Hope this helps.

r3t40

To find the general solution for the differential equation y''' - y'' + 4y' - 4y = 0, we solve the characteristic equation r³ - r² + 4r - 4 = 0, and find the roots r = 1 and r = ±2i. Thus, the general solution is y(x) = C1eˣ + C2cos(2x) + C3sin(2x).

The given differential equation is:

y''' - y'' + 4y' - 4y = 0

This is the general solution to the differential equation y''' - y'' + 4y' - 4y = 0.

Answer with explanation:

Number of Letters from which we have to make four​-letter passwords

   ={A,B,C,D,E,F,G}=7

Since repetition of digit is not allowed.In Permutation order of arrangement is Important,while in combination order of arrangement is not Important.

Out of seven letters we have to select four letters, keeping in mind the order of Alphabets.So, we will use the concept of Permutation.

Number of ways of arrangement,that is to make four letter password from 7 Alphabets

       [tex]_{4}^{7}\textrm{P}\\\\=\frac{7!}{(7-4)!}\\\\=\frac{7!}{3!}\\\\=4\times 5\times 6 \times 7=840[/tex]

So, total number of ways of making password from 7 alphabets=840 ways

Second Method⇒

Since repetition of alphabets is not allowed, first Alphabet can be chosen in 7 ways , second alphabet can be chosen in 6 ways, third alphabet can be chosen in 5 ways, fourth alphabet can be chosen from four alphabets.

So, total number of ways of making four letter password

       =7×6×5×4

    = 840 ways

We can form 840 unique four-letter passwords with no repeats from the letters A, B, C, D, E, F, G. This is a problem in combinatorics, calculating permutations of positions in the password.

We are trying to determine the number of unique four-letter passwords that can be created using the letters A, B, C, D, E, F, G with no repetition of letters. This is a problem of permutations, a concept in combinatorics, a branch of mathematics that deals with counting.

In this case, for the first position of the password, we have 7 choices. Once we've picked this first letter, we then have 6 remaining letters to choose from for the second position. Similarly, there are 5 choices remaining for the third position and then 4 for the last position.

The total number of password combinations will then be a product of the number of choices for each of the positions. Mathematically, this can be represented as 7*6*5*4.

Consequently, there are 840 different four-letter passwords that can be created from the given letters without repeating any letter.

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Answer:

The total number of luxury cars are 43.

Step-by-step explanation:

Consider the provided information.

It is given that there are 260 cars in the parking lot out of 1/2 are SUVs.

Total number of SUV cars = [tex]260\times{\frac{1}{2}=130}[/tex]

Out of 260 cars 1/3 are sub compact cars.

Total number of sub compact cars = [tex]260\times{\frac{1}{3}}=86.66\approx{87}[/tex]

Therefore the total number of luxury cars are:

260 - 130 - 87 = 43

Therefore, the total number of luxury cars are 43.

Answer:(x-3)=-(y-5)=z

Step-by-step explanation:

Given

the point through which line passes is (3,5,0)

so we need a vector along the line to get the equation of line

It is given that line is perpendicular to both i+j & j+k

therefore their cross product will give us the vector perpendicular to both

v=(i+j)\times (j+k)=i-j+k

therefore we get direction vector of line so we can write

[tex]\frac{x-3}{1}=\frac{y-5}{-1} =\frac{z-0}{1}[/tex]=t

i.e.

x=t+3,y=-t+5,z=t

The parametric form of the equation is;

The symmetric form of the equation is [tex]\rm x - 3 = -(y -5) = z[/tex].

Given

The line through (3, 5, 0) and perpendicular to both i + j and j + k

[tex]\rm \dfrac{x-x_1}{a}=\dfrac{y-y_1}{b}=\dfrac{z-z_1}{c}=t[/tex]

Where the value of [tex]\rm x_1=3, \ y_1=5\ and \ z_1=0[/tex].

To find a, b, c by evaluating the product of ( i + j) and ( j + k ).

[tex]\rm= (i+j)\times (j+k)\\\\= i-j+k[/tex]

The value of a = 1, b = -1 and c = 1.

Substitute all the values in the equation.

[tex]\rm \dfrac{x-x_1}{a}=\dfrac{y-y_1}{b}=\dfrac{z-z_1}{c}\\\\\dfrac{x-3}{1}=\dfrac{y-5}{-1}=\dfrac{z-0}{1}\\\\(x-3)=-(y-5)=z[/tex]

Therefore,

The parametric form of the equation is;

[tex]\rm x=x_1+at, \ x=3+1t, \ x=3+t\\\\y=y_1+at, \ y=5+(-1)t, \ y=5-t\\\\z=z_1+at, \ z=0+a(1), \ z=a[/tex]

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Answer: Option 'd' is correct.

Step-by-step explanation:

Since we have given that

Volume of an excavation = 203 cubic feet

Weight of the material = 1200 pounds per cubic yard

So, the weight of the excavation would be

Volume of an excavation × Weight of the material

[tex]=203\times 1200\\\\=243,600\ pounds[/tex]

Hence, the weight of the excavation is 243,600 pounds.

Therefore, Option 'd' is correct.

Answer:

81 lots of 5,000 square feet fits in the property.

Step-by-step explanation:

The first step is calculate the square feet of the minimum area:

[tex]50 \: feets \times 100 \: feet = 5,000 \:square \: feet[/tex]

Second, from the ten acres we subtract the 26,000 feets of roads:

[tex]1 \: acre = 60 \: feet \times 660\:feet = 43,560\:square\:feet\\43,560 \times 10 = 435,600\\435,600 - 26,000 = 409,600 \:square \: feet\:available[/tex]

Third, we divide the lot area over the available square feet

[tex]\frac{409,600}{5,000} = 81.92[/tex]

81 lots of 5,000 square feet fits in the property.

Answer:

Therefore, the inverse of given matrix is

[tex]=\begin{pmatrix}\frac{2}{5}&-\frac{1}{5}\\ -\frac{1}{5}&\frac{4}{15}\end{pmatrix}[/tex]

Step-by-step explanation:

The inverse of a square matrix [tex]A[/tex] is [tex]A^{-1}[/tex] such that

[tex]A A^{-1}=I[/tex] where I is the identity matrix.

Consider, [tex]A = \left[\begin{array}{ccc}4&3\\3&6\end{array}\right][/tex]

[tex]\mathrm{Matrix\:can\:only\:be\:inverted\:if\:it\:is\:non-singular,\:that\:is:}[/tex]

[tex]\det \begin{pmatrix}4&3 \\3&6\end{pmatrix}\ne 0[/tex]

[tex]\mathrm{Find\:2x2\:matrix\:inverse\:according\:to\:the\:formula}:\quad \begin{pmatrix}a\:&\:b\:\\ c\:&\:d\:\end{pmatrix}^{-1}=\frac{1}{\det \begin{pmatrix}a\:&\:b\:\\ c\:&\:d\:\end{pmatrix}}\begin{pmatrix}d\:&\:-b\:\\ -c\:&\:a\:\end{pmatrix}[/tex]

[tex]=\frac{1}{\det \begin{pmatrix}4&3\\ 3&6\end{pmatrix}}\begin{pmatrix}6&-3\\ -3&4\end{pmatrix}[/tex]

[tex]\mathrm{Find\:the\:matrix\:determinant\:according\:to\:formula}:\quad \det \begin{pmatrix}a\:&\:b\:\\ c\:&\:d\:\end{pmatrix}\:=\:ad-bc[/tex]

[tex]4\cdot \:6-3\cdot \:3=15[/tex]

[tex]=\frac{1}{15}\begin{pmatrix}6&-3\\ -3&4\end{pmatrix}[/tex]

[tex]=\begin{pmatrix}\frac{2}{5}&-\frac{1}{5}\\ -\frac{1}{5}&\frac{4}{15}\end{pmatrix}[/tex]

Therefore, the inverse of given matrix is

[tex]=\begin{pmatrix}\frac{2}{5}&-\frac{1}{5}\\ -\frac{1}{5}&\frac{4}{15}\end{pmatrix}[/tex]

Answer:  The required solution is

[tex]y=(t-\dfrac{t^3}{2}+~~.~~.~~.).[/tex]

Step-by-step explanation:  We are given to find the solution of the following differential equation using power series method :

[tex]y^\prime+ty=0,~~y(0)=1~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]

Let [tex]y=\sum_{n=0}^{\infty}a_nq^n[/tex] be the solution of the given equation.

Then, we have

[tex]y^\prime=\sum_{n=1}^{\infty}a_nnt^{n-1}.[/tex]

From equation (i), we get

[tex]\sum_{n=1}^{\infty}a_nnt^{n-1}+t\sum_{n=0}^{\infty}a_nt^n=0\\\\\\\Rightarrow \sum_{n=1}^{\infty}a_nnt^{n-1}+t\sum_{n=-1}^{\infty}a_nt^{n+1}=0.[/tex]

Comparing the coefficients of [tex]t^n,~t^{n+1},~,~~.~~.~~.[/tex] from both sides of the above, we get

[tex]2a_2+a_0\\\\\Rightarrow a_2=-\dfrac{a_0}{2},\\\\\\3a_3+a_1=0\\\\\Rightarrow a_3=-\dfrac{a_1}{3},\\\\\\\vdots~~~\vdots~~~\vdots[/tex]

Therefore, we get

[tex]y=a_0(1-\dfrac{1}{2}t^2+~~.~~.~~.)+a_1(t-\dfrac{t^3}{2}+~~.~~.~~.).[/tex]

The condition y(0) = 1 gives

[tex]a_0=0.[/tex]

So, the required solution is

[tex]y=t-\dfrac{t^3}{2}+~~.~~.~~.[/tex]

Answer with explanation:

The diiferential equation of first order is,

  y'+t y=0

[tex]y=\sum_{n=0}^{\infty}a_{n}x^n\\\\y'=\sum_{n=1}^{\infty}na_{n}x^{n-1}\\\\y'+ty=\sum_{n=0}^{\infty}na_{n-1}x^{n-1}+t\sum_{n=0}^{\infty}a_{n}x^n\\\\=\sum_{n=0}^{\infty}(a_{n-1}\frac{n}{x}+a_{n}t)x^n\\\\\rightarrow y'+t y=0\\\\\rightarrow a_{n-1}\frac{n}{x}+a_{n}t=0\\\\a_{n-1}=\frac{-xta_{n}}{n}[/tex]

For, n=1

[tex]a_{0}=\frac{-xta_{1}}{1}\\\\a_{0}=-txa_{1}\\\\a_{1}=\frac{-a_{0}}{tx}\\\\\text{for}, n=2\\\\a_{1}=\frac{-xta_{2}}{2}\\\\a_{2}=\frac{-2a_{1}}{xt}\\\\=\frac{2a_{0}}{x^2t^2}\\\\\text{for}, n=3\\\\a_{2}=\frac{-xta_{3}}{3}\\\\a_{3}=\frac{-6a_{0}}{x^3t^3}\\\\a_{4}=\frac{24a_{0}}{x^4t^4}\\\\a_{n}=(-1)^n\frac{n!a_{0}}{x^nt^n}[/tex]

So,the series can be written as

    [tex]y_{n}=\sum_{n=1}^{\infty}(-1)^n\frac{n!a_{0}}{x^nt^n}[/tex]

Answer:

[tex]A_{38} = 350[/tex]

Step-by-step explanation:

The 5th term of the arithmetic sequence is 53. We can write the equation:

[tex]a + 4d = 53...(1)[/tex]

The 6th term of the arithmetic sequence is 62. We can write the equation:

[tex]a + 5d = 62...(2)[/tex]

Subtract the first equation from the second one to get:

[tex]5d - 4d = 62 - 53[/tex]

[tex]d = 9[/tex]

The first term is

[tex]a + 4(9) = 53[/tex]

[tex]a + 36 = 53[/tex]

[tex]a = 53 - 36[/tex]

[tex]a = 17[/tex]

The 38th term of the sequence is given by:

[tex] A_{38} = a + 37d[/tex]

[tex]A_{38} = 17+ 37(9)[/tex]

[tex]A_{38} = 350[/tex]

Answer:

[tex]A_{38}=386[/tex]

Step-by-step explanation:

We have been given an arithmetic sequence gas [tex]A_1,A_2,A_3,A_4[/tex] as :53,62,71,80. We are asked to find [tex]A _{38}[/tex].

We know that an arithmetic sequence is in format [tex]a_n=a_1+(n-1)d[/tex], where,

[tex]a_n[/tex] = nth term,

[tex]a_1[/tex] = 1st term of sequence,

n = Number of terms,

d = Common difference.

We have been given that 1st term of our given sequence is 53.

Now, we will find d by subtracting 71 from 80 as:

[tex]d=80-71=9[/tex]

[tex]A_{38}=53+(38-1)9[/tex]

[tex]A_{38}=53+(37)9[/tex]

[tex]A_{38}=53+333[/tex]

[tex]A_{38}=386[/tex]

Therefore, [tex]A_{38}=386[/tex].

Answer:

yes. The cost of the insurance is less than the probability cost of the operation

Step-by-step explanation:

yes. The cost of the insurance is less than the probability cost of the operation

The cost of health insurance = $1200

Cost of dramatic injury operation= $500,000

chances of need of operation= 47.3% over a 20 years period

the amount of pay insurance after 20 years= [tex]20\times 1200= 240,00[/tex]

probable  of cost operation= 0.473*500,00= $236,500

clearly the cost of insurance is less than the probable  cost of operation.

Answer:

1388 dollars 77 cents.

Step-by-step explanation:

Since, the amount formula in compound interest is,

[tex]A=P(1+\frac{r}{n})^{nt}[/tex]

Where, P is the principal amount,

r is the annual rate,

n is the number of periods in a year,

t is the number of years,

Given,

P = $ 1,282,

r = 1 % = 0.01,

n = 353,

t = 8 years,

Hence, the amount after 8 years would be,

[tex]A=1282(1+\frac{0.01}{353})^{2824}[/tex]

[tex]=\$ 1388.77244711[/tex]

[tex]\approx \$ 1388.77[/tex]

= 1388 dollars 77 cents.

Answer:

1.2

Step-by-step explanation:

Answer:

[tex]f(x)=(x-2)(x)(x+4)^2[/tex]

Step-by-step explanation:

Since there is a multiplicity at x=-4, that would meant that that part of the factor would have to have an even degree. This means that it would have to be 2.

This would give you [tex]f(x)=(x-2)(x)(x+4)^2[/tex]

Answer:

[tex]f (x) = x (x + 4)^2(x-2)[/tex]

Step-by-step explanation:

The zeros of the polynomial are all the values of x for which the function [tex]f (x) = 0[/tex]

In this case we know that the zeros are:

[tex]x = -4,\ x+4 =0[/tex]

[tex]x = -4,\ x+4 =0[/tex]

[tex]x = 0[/tex]

[tex]x = 2[/tex], [tex]x - 2 = 0[/tex]

Now we can write the polynomial as a product of its factors

[tex]f (x) = x (x + 4)(x+4) (x-2)[/tex]

[tex]f (x) = x (x + 4)^2(x-2)[/tex]

Note that the polynomial is of degree 4 because the greatest exponent of the variable x that results from multiplying the factors of f(x) is 4

Answer: 18

Step-by-step explanation:

Given : Margin of error = 3 ounces

Significance level : [tex]\alpha = 1-0.99=0.1[/tex]

Critical value : [tex]z_{\alpha/2}=2.576[/tex]

Standard deviation :[tex]\sigma=5\text{ ounces}[/tex]

The formula to calculate the sample size is given by :-

[tex]n=(\dfrac{z_{\alpha/2}\ \sigma}{E})^2[/tex]

[tex]\Rightarrow\ n=(\dfrac{2.576\times5}{3})^2\\\\\Rightarrow\ n=18.4327111111\approx18[/tex]

Hence, the minimum sample size should be 18.

To estimate the birth weight of infants, the doctor must select a sample size of at least 19 infants to be 99% confident that the true mean is within 3 ounces of the sample mean. This calculation is based on the given standard deviation of 5 ounces.

To determine the sample size needed to estimate the birth weight of infants, we will use the formula for a margin of error:

Margin of Error = (Z-value) * (Standard Deviation / Square Root of Sample Size)

Since the doctor wants to be 99% confident that the true mean is within 3 ounces of the sample mean, the Z-value will be 2.576 (corresponding to a 99% confidence level). The given standard deviation is 5 ounces. Plugging these values into the formula, we get:

3 = 2.576 * (5 / Square Root of Sample Size)

Solving for the sample size:

Square Root of Sample Size = 2.576 * 5 / 3

Square Root of Sample Size ≈ 4.293

Sample Size ≈ 18.41

Since the sample size must be a whole number, the doctor must select a sample size of at least 19 infants to be 99% confident that the true mean is within 3 ounces of the sample mean.

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The situation can be modelled by the linear function r = $5.50t/10 + $8, where 't' is time and 'r' is cost. For a $25 rental, approximately 31 minutes can be rented. A linear model is appropriate as the cost increases steadily with time.

In this case, the independent variable is time (t), in minutes, and the dependent variable is rental cost (r), in dollars. Here, 't' is the time on the computer, and 'r' is the total cost.

The linear function for this situation would be r = $5.50t/10 + $8. Note that $5.50t/10 is the cost per minute (as the rate is $5.50 every 10 minutes), and $8 is the setup fee.

To calculate how much time can be rented for $25, we solve for 't' when r = $25. $25 = $5.50t/10 + $8 gives t = (25 - 8) x 10/5.5, or roughly t = 31 minutes.

A linear model is reasonable for this situation as the cost of renting the computer increases steadily with time.

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The correct option is B.  The independent variable is time​ (t), in​ minutes, and the dependent variable is rental cost​ (r), in dollars. The linear function that models this situation is r equals . The cost equation is r = 8 + 0.55t, with t as the independent variable and r as the dependent variable. For $25, approximately 31 minutes can be rented.

The given situation can be modeled by a linear function where the total rental cost depends on the time rented. Here, the independent variable is time (t) in minutes, and the dependent variable is rental cost (r) in dollars.

Option B: The linear function that models this situation is:

→ r = 8 + 0.55t

To find the time that can be rented for $25:

→ Set r = 25 and solve for t:

→ 25 = 8 + 0.55t

Subtract 8 from both sides:

→ 17 = 0.55t

Divide both sides by 0.55:

→ t = 30.91 (approximately)

Rounding to the nearest minute, the time that can be rented is 31 minutes.

Answer:

yes they are linearly independent

Step-by-step explanation:

By definition of linear dependence we have if  f(x) and g(x) be 2 functions

if they are linearly dependent then we can write

f(x) = αg(x)...........(i) where α is an arbitrary constant

in our case we can see that the range of sin(x) is only from [-1,+1] while as [tex]e^{x}[/tex] has range from [0,∞]

thus we cannot find any value of α for which (i) is valid

To calculate the number of different ways the members of the cabinet can be appointed, we can use the concept of permutations. Using the formula for permutations, it is found that there are 3003 different ways the members of the cabinet can be appointed.

To calculate the number of different ways the members of the cabinet can be appointed, we can use the concept of permutations. Since there are 15 eligible candidates for the remaining 5 spots, and the order in which the members are appointed matters, we can use the formula for permutations:

P(n, r) = n! / (n - r)!

Where n is the total number of candidates and r is the number of spots available. In this case, we have:

P(15, 5) = 15! / (15 - 5)!

Calculating this gives us:

P(15, 5) = 15! / 10!

P(15, 5) = (15 × 14 × 13 × 12 × 11) / (5 × 4 × 3 × 2 × 1)

P(15, 5) = 3003

Therefore, there are 3003 different ways the members of the cabinet can be appointed.

Answer:

Height = 56 cm

Step-by-step explanation:  

let the width of photograph  be = 'w' cm

let the Height of photograph be = 'h' cm

Now it is given that height is 40 cm greater than width

=> h = w + 40 cm.............................(i)

Now it is given that area of photograph = [tex]896cm^{2}[/tex]

We know that area = [tex]Width^{}[/tex]x[tex]Height^{}[/tex]

Thus we have [tex]h^{}[/tex] x [tex]w^{}[/tex]=[tex]896cm^{2}[/tex]

Applying value of 'h' from equation i we get

[tex](w+40^{})[/tex]x[tex]w^{}[/tex]=[tex]896cm^{2}[/tex]

[tex]w^{2} +40w=896cm^{2}[/tex]

This is a quadratic equation in 'w' whose solution in standard form is given by

w=[tex]\frac{-b\mp\sqrt{b^{2}-4ac}}{2a}[/tex]

upon comparing with standard equation  we see that

a =1

b=40

c=896

applying values in the formula we get

w=[tex]\frac{-40\mp\sqrt{40^{2}-4\times 1\times- 896}}{2 \times1 }[/tex]

w1 = 16 cm

w2 = -56 cm

We discard -56 cm since length cannot be negative thus

width = 16 cm

Height = 40+16 cm = 56 cm  

Answer: [tex]\dfrac{1}{59049}[/tex]

Step-by-step explanation:

The number of keys on the keypad = 9

The number of digits in the required pin code = 4

If repetition is allowed then , the number of possible codes will be

[tex](9)^5=59049[/tex]

Then , the probability that the choosen pin code is correct is given by :-

[tex]\dfrac{1}{59049}[/tex]

The probability of Geometric distribution formula :

[tex]P(X=x)=(1-p)^{x-1}p[/tex], where p is the probability of success and x is the number of attempt.

Using geometric probability , the probability of a correct guess on the first​ try is given by :-

[tex]P(X=1)=(1-\dfrac{1}{59049})^{1-1}(\dfrac{1}{59049})=\dfrac{1}{59049}[/tex]