find a polynomial function f(x) of least degree having only real coefficients and zeros of 5 and 2-i

The null hypothesis assumes that there is no change in the percentage, while the alternative hypothesis suggests an increase in the proportion of workers with a travel time exceeding 60 minutes.

We have,

The null and alternative hypotheses for testing the economist's belief can be defined as follows:

Null hypothesis (H₀): The percentage of workers with a travel time to work of more than 60 minutes is still 12.1%.

Alternative hypothesis (H₁): The percentage of workers with a travel time to work of more than 60 minutes has increased.

In mathematical notation:

H₀: p = 0.121 (p represents the proportion of workers with a travel time > 60 minutes)

H₁: p > 0.121

Thus,

The null hypothesis assumes that there is no change in the percentage, while the alternative hypothesis suggests an increase in the proportion of workers with a travel time exceeding 60 minutes.

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Since the number of digits is even, we have n = 2k for some integer k, and thus the sum has k pairs. This means that the sum is divisible by 11, and therefore the palindromic integer is also divisible by 11.

To prove that every palindromic integer with even number of digits is divisible by 11, we can use the following approach:

Let's consider an arbitrary palindromic integer with an even number of digits. We can represent it as follows:

a1a2a3...an-2an-1anan-1an-2...a3a2a1

where a1, a2, ..., an-1, an are digits.

Now, we can group the digits in pairs:

a1a2, a3a4, ..., an-2an-1, anan-1

and compute their sum:

(a1a2 + a3a4 + ... + an-2an-1 + anan-1)

We notice that the sum of the first and last pairs is equal to the sum of the second and second-to-last pairs, and so on. This means that the sum can be written as:

(a1a2 + anan-1) + (a3a4 + an-2an-1) + ...

Now, we can factor out 11 from each pair:

(a1a2 + anan-1) + (a3a4 + an-2an-1) + ... = 11*(a1 - an) + 11*(a2 - an-1) + ...

Since the number of digits is even, we have n = 2k for some integer k, and thus the sum has k pairs. This means that the sum is divisible by 11, and therefore the palindromic integer is also divisible by 11.

Therefore, we have proved that every palindromic integer with an even number of digits is divisible by 11.

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The equivalent expression is (5x + 2)(x + 1)

Algebraic expressions are mathematical expressions that comprises of variables, terms, coefficients, factors and constants.

Also, note that equivalent expressions are defined as expressions having the same solution but differ in the arrangement of its variables.

From the information given, we have that;

5x²+2=-7x

Put into standard form

5x² + 7x + 2 = 0

To solve the quadratic equation, we have to find the pair factors of the product of 5 and 2 that sum up to 7, we have;

Substitute the values

5x² + 5x + 2x + 2 = 0

group in pairs

(5x² + 5x) + ( 2x + 2 ) = 0

factorize the expression

5x(x + 1) + 2(x + 1) = 0

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Answer:

20 females

Step-by-step explanation:

40%=0.4

0.4*50=20

Answer:

10

Step-by-step explanation:

50/10 = 5

5 Seals per 10 %

5 x 2 (20 percent) gives us 10 Seals

The surface area of the cube is 726 cm^2.

The surface area of a given shape is the summation or the total value of the area of each of its external surfaces. Thus the total surface of a shape depends on the number of its external surface, and the shape of each.

In the given question, the cube has a side length of 11 cm. Since each surface of the cube is formed from a square, then;

area of a square = length x length

                  = 11 x 11

                  = 121 sq. cm.

Total surface area of the cube = number of its surface x area of each surface

                                                = 6 x 121

                                                = 726

The surface area of the cube is 726 sq. cm.

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Few people will use your business' Internet site to purchase products if they feel it is a. Not secure.

Providing a sense of security is crucial for a website since it aids in the assessment of its credibility by users who are about to provide confidential personal and monetary details. When browsing any given site, customers can become irritated and give up on making purchases if they find it challenging to navigate or locate information necessary for, say, product purchase.

Moreover, slow-loading web pages might force them to seek faster shopping alternatives that could result in customer defection. Conversely, an aesthetically pleasing, expertly designed online portal fosters confidence among shoppers, encouraging them to make transactions with ease.

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The volume of the right rectangular prism is 156 cubic centimeters.

We have,

The formula for the volume of a rectangular prism is:

V = l x w x h

where V is the volume, l is the length, w is the width, and h is the height.

Using the given values, we can substitute them into the formula to find the volume of the rectangular prism:

V = 13 cm x 4 cm x 3 cm

V = 156 cm^3

Therefore,

The volume of the right rectangular prism is 156 cubic centimeters.

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The sale price of the ticket is $57.05

The ticket for the summer concert is $81.50

The ticket will be on sale for 30% off

The sale price can be calculated as follows

81.50 × 30/100

= 81.50 × 0.3

= 24.45

Sale price= 81.50-24.45

= 57.05

Hence the sale price is $57.05

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The slope of the linaer equation is a = 1/2.

A general linear equation can be written as:

y = a*x + b

Where a is the slope and b is the y-intercept.

If the line passes through two points (x₁, y₁) and (x₂, y₂), then the slope of that line is given by:

a = (y₂ - y₁)/(x₂ - x₁)

Here we know two points on the line which are (-4, -1) and (4, 3), replacing these values in the formula above we will get:

a = (3 + 1)/(4 + 4) = 4/8 = 1/2

That is the slope of the linear equation.

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Answer:

C

Step-by-step explanation:

y=-2x+4

2x+y=4

2x-2x+4=4

4=4

The mean of the data-set in this problem is given as follows:

41.6 inches.

The mean of a data-set is given by the sum of all observations in the data-set divided by the number of observations, which is also called the cardinality of the data-set.

Considering the stem-and-leaf plot, the observations are given as follows:

20, 32, 34, 36, 40, 42, 44, 48, 55, 65.

The sum of the observations is given as follows:

20 + 32 + 34 + 36 + 40 + 42 + 44 + 48 + 55 + 65 = 416 inches.

There are 10 observations, hence the mean is given as follows:

416/10 = 41.6 inches.

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1. MULTIPLE-CHOICE CONSTRAINT - c.; 2. COREQUISITE CONSTRAINT - e.; 3. K OUT OF N ALTERNATIVES CONSTRAINT - b.; 4. CONDITIONAL CONSTRAINT - a.; 5. MUTUALLY EXCLUSIVE CONSTRAINT - d.

1. MULTIPLE-CHOICE CONSTRAINT - an example of the this is c. A constraint requiring that the sum of two or more binary variables equals one. Thus, any feasible solution makes a choice of which variable to set equal to one.

2. COREQUISITE CONSTRAINT - This is associated with e. A constraint requiring that two binary variables be equal and that they are both either in or out of the solution.

3. K OUT OF N ALTERNATIVES CONSTRAINT - This corresponds to b. A constraint requiring that the sum of n binary variables equals k.

4. CONDITIONAL CONSTRAINT - This matches with a. A constraint involving binary variables that does not allow certain variables to equal one unless certain other variables are equal to one.

5. MUTUALLY EXCLUSIVE CONSTRAINT - This fits the description of d. A constraint requiring that the sum of two or more binary variables be less than or equal to one. Thus, if one of the variables equals one, the others must equal zero. However, all variables could equal zero.

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There is a 46.39% probability that in one garbage dump there will be garbage with an amount between 7000 ton to 9000 ton per day.

To answer the first part of the question, we can use the standard normal distribution and calculate the z-value for the given range of garbage amount:

z = (9000 - 8500) / 154 = 0.3247

z = (7000 - 8500) / 154 = -0.974

Using a standard normal distribution table, we can find that the probability of a garbage dump having an amount between 7000 and 9000 tons per day is:

P(-0.974 < Z < 0.3247) = P(Z < 0.3247) - P(Z < -0.974)

= 0.6274 - 0.1635

= 0.4639

Therefore, there is a 46.39% probability that in one garbage dump there will be garbage with an amount between 7000 ton to 9000 ton per day.

For the second part of the question, we can calculate the confidence interval for the average garbage amount using the formula:

Confidence interval = X± Zα/2 * σ/√n

where Xis the sample mean (8,500 ton), σ is the population standard deviation (154 ton), n is the sample size (50), Zα/2 is the critical value of the standard normal distribution for the given significance level and is calculated as:

Zα/2 = ± 1.96 (for 5% significance level)

Substituting the values, we get:

Confidence interval = 8500 ± 1.96 * 154 / √50

= 8500 ± 43.17

= (8456.83, 8543.17)

The interpretation of this confidence interval is that we are 95% confident that the true population mean of garbage amount per day in Jakarta lies between 8456.83 and 8543.17 tons. This means that if we were to take multiple samples of size 50 from the population and compute their confidence intervals using the same method, 95% of those intervals would contain the true population mean.

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The statement "an endomorphism is injective if and only if it is not an eigenvalue" is not true in general.

An endomorphism is a linear map from a vector space to itself. An endomorphism is said to be injective if it preserves distinctness of elements, i.e., if it maps different vectors to different vectors. On the other hand, an eigenvalue of an endomorphism is a scalar that satisfies a certain equation involving the endomorphism and a non-zero vector called an eigenvector.

Now, the statement "an endomorphism is injective if and only if it is not an eigenvalue" is not true in general. In fact, the two concepts are not directly related. It is possible for an endomorphism to be injective and have eigenvalues, and it is possible for an endomorphism to not have eigenvalues and not be injective.

However, if we consider a specific case where the endomorphism is a linear transformation on a finite-dimensional vector space, then we can make the following statement: "an endomorphism is injective if and only if it does not have 0 as an eigenvalue." This statement is true because an endomorphism is injective if and only if its kernel (the set of vectors it maps to 0) is trivial (only the zero vector). This happens if and only if 0 is not an eigenvalue, since an eigenvalue of 0 means that there exists a non-zero vector that is mapped to 0.

In summary, the statement "an endomorphism is injective if and only if it is not an eigenvalue" is not true in general, but it is true in the specific case of a linear transformation on a finite-dimensional vector space: "an endomorphism is injective if and only if it does not have 0 as an eigenvalue."

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To find the probability that 1 out of the 3 items in the sample is defective when a properly functioning machine produces 8 out of 10 non-defective items, follow these steps:

1. Determine the probability of a single item being defective and non-defective:
  - Probability of non-defective (P(ND)) = 8/10 = 0.8
  - Probability of defective (P(D)) = 1 - P(ND) = 1 - 0.8 = 0.2

2. Use the binomial probability formula for finding the probability of exactly 1 defective item in a sample of 3:
  - P(X = 1) = (3 choose 1) * (P(D))^1 * (P(ND))^(3-1)
 
3. Calculate the binomial coefficient (3 choose 1):
  - (3 choose 1) = 3! / (1! * (3-1)!) = 3

4. Plug in the values and solve the formula:
  - P(X = 1) = 3 * (0.2)^1 * (0.8)^2
  - P(X = 1) = 3 * 0.2 * 0.64
  - P(X = 1) = 0.384

So, the probability that 1 of the 3 items in the sample is defective when the machine is functioning properly is 0.384 or 38.4%.

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Y follows a negative binomial distribution with parameters r = 3 and p = 0.97.

The moment generating function (MGF) of a random variable X is defined as Mx(t) = E(e^(tX)).

(a) The given MGF is 0.03 Mx(0) t< - log 0.97 1 -0.97e^(tX)

The MGF of the geometric distribution with parameter p is given by Mx(t) = E(e^(tX)) = Σ [p(1-p)^(k-1)]e^(tk), where the sum is taken over all non-negative integers k.

Comparing this with the given MGF, we can see that p = 0.97. Therefore, X follows a geometric distribution with parameter p = 0.97.

(b) Let Y = X1 + X2 + X3, where X1, X3, and X3 are independent and identically distributed geometric random variables with parameter p = 0.97.

The MGF of Y can be obtained as follows:

My(t) = E(e^(tY)) = E(e^(t(X1 + X2 + X3))) = E(e^(tX1) * e^(tX2) * e^(tX3))

= Mx(t)^3, since X1, X2, and X3 are independent and identically distributed with the same MGF

Substituting the given MGF of X, we get:

My(t) = (0.03 Mx(0) t< - log 0.97 1 -0.97e^(t))^3

Therefore, Y follows a negative binomial distribution with parameters r = 3 and p = 0.97.

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Answer:

[tex] \sqrt{175 {x}^{2} {y}^{3} } = \sqrt{175} \sqrt{ {x}^{2} } \sqrt{ {y}^{3} } = \sqrt{25} \sqrt{ {x}^{2} } \sqrt{ {y}^{2} } \sqrt{7} \sqrt{y} = 5xy \sqrt{7y} [/tex]

To find the maximum distance between the point (1,3) and a point on the circle of radius 4 centered at the origin, we can use the distance formula. Let (x,y) be a point on the circle, then the distance between (1,3) and (x,y) is given by:

d = √((x-1)^2 + (y-3)^2)

Since the point (x,y) lies on the circle of radius 4 centered at the origin, we have:

x^2 + y^2 = 16

We can solve for y in terms of x:

y = ±√(16 - x^2)

Substituting into the distance formula, we get:

d = √((x-1)^2 + (±√(16 - x^2) - 3)^2)

Simplifying and squaring, we get:

d^2 = (x-1)^2 + (±√(16 - x^2) - 3)^2

d^2 = x^2 - 2x + 1 + (16 - x^2 - 6√(16 - x^2) + 9)  (or d^2 = x^2 - 2x + 1 + (16 - x^2 + 6√(16 - x^2) + 9))

d^2 = -x^2 - 2x + 26 ± 6√(16 - x^2)

To maximize the distance, we want to maximize d^2. Note that the maximizing distance should be at least 4, which means that we only need to consider the positive root of d^2. The critical points of d^2 occur when the derivative is zero, so we differentiate with respect to x:

d(d^2)/dx = -2x - 2(±3x/√(16 - x^2))

Setting this equal to zero, we get:

x = ±4/√5, ±2√2/√5, 0

Note that x = 0 corresponds to the point (0,4) on the circle, which has distance 5 from (1,3), so it is not a critical point. The other critical points correspond to the points where the circle intersects the x-axis and the y-axis. Evaluating d^2 at these critical points, we get:

d^2 = 18 ± 6√6

The maximum distance is therefore √(18 + 6√6), which occurs when x = ±4/√5.

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(i) c = 1/2 and the joint pdf is f(x, y) = (x+y)/2 over the unit square.

(ii) 1/16

(iii) 1/9

iv)  5/3

(v) E(X+Y) = 5/6.

we have,

i.

In order for f(x, y) to be a valid joint pdf, it must satisfy two conditions:

It must be non-negative for all (x,y)

The integral over the entire support must equal 1.

To satisfy the first condition, we need c(x+y) to be non-negative.

This is true as long as c is non-negative and x+y is non-negative over the support, which is the unit square [0,1]x[0,1]. Since x and y are both non-negative over the unit square, we need c to be non-negative as well.

To satisfy the second condition, we integrate f(x, y) over the unit square and set it equal to 1:

1 = ∫∫ f(x, y) dx dy

 = ∫∫ c(x+y) dx dy

 = c ∫∫ (x+y) dx dy

 = c [∫∫ x dx dy + ∫∫ y dx dy]

 = c [∫ 0^1 ∫ 0^1 x dx dy + ∫ 0^1 ∫ 0^1 y dx dy]

 = c [(1/2) + (1/2)]

 = c

ii.

P(X < 0.5, Y < 0.5) can be found by integrating the joint pdf over the region where X < 0.5 and Y < 0.5:

P(X < 0.5, Y < 0.5) = ∫ 0^0.5 ∫ 0^0.5 (x+y)/2 dy dx

                    = ∫ 0^0.5 [(xy/2) + (y^2/4)]_0^0.5 dx

                    = ∫ 0^0.5 [(x/4) + (1/16)] dx

                    = [(x^2/8) + (x/16)]_0^0.5

                    = (1/32) + (1/32)

                    = 1/16

iii.

P(Y<X) can be found by integrating the joint pdf over the region where

Y < X:

P(Y < X) = ∫ 0^1 ∫ 0^x (x+y)/2 dy dx

        = ∫ 0^1 [(xy/2) + (y^2/4)]_0^x dx

        = ∫ 0^1 [(x^3/6) + (x^3/12)] dx

        = (1/9)

iv.

P(X+Y) < 5 can be found by integrating the joint pdf over the region where X+Y < 5:

P(X+Y < 5) = ∫ 0^1 ∫ 0^(5-x) (x+y)/2 dy dx

          = ∫ 0^1 [(xy/2) + (y^2/4)]_0^(5-x) dx

          = ∫ 0^1 [(x(5-x)/2) + ((5-x)^2/8)] dx

          = 5/3

v.

The expected value of XY can be found by integrating the product xy times the joint pdf over the entire support:

E(XY) = ∫∫ xy f(x, y) dx dy

E(XY) = ∫∫ xy (x+y)/2 dx dy

= ∫∫ (x^2y + xy^2)/2 dx dy

= ∫ 0^1 ∫ 0^1 (x^2y + xy^2)/2 dx dy

= ∫ 0^1 [(x^3*y/3) + (xy^3/6)]_0^1 dy

= ∫ 0^1 [(y/3) + (y/6)] dy

= 1/4

The expected value of X+Y can be found by integrating the sum (x+y) times the joint pdf over the entire support:

E(X+Y) = ∫∫ (x+y) f(x, y) dx dy

      = ∫∫ (x+y) (x+y)/2 dx dy

      = ∫∫ [(x^2+2xy+y^2)/2] dx dy

      = ∫ 0^1 ∫ 0^1 [(x^2+2xy+y^2)/2] dx dy

      = ∫ 0^1 [(x^3/3) + (xy^2/2) + (y^3/3)]_0^1 dy

      = ∫ 0^1 [(1/3) + (y/2) + (y^2/3)] dy

      = 5/6

Thus,

(i) c = 1/2 and the joint pdf is f(x, y) = (x+y)/2 over the unit square.

(ii) 1/16

(iii) 1/9

iv)  5/3

(v) E(X+Y) = 5/6.

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a) The system of equations that represents the scenario is given as follows:

b) The costs are given as follows:

The variables for the system of equations are defined as follows:

Castel spent $115 on 5 rose bushes and 12 geraniums, hence:

5x + 12y = 115.

Kail spent $94 on 10 rose bushes and 8 geraniums, hence:

10x + 8y = 94

Then the system is defined as follows:

Multiplying the first equation by 2 and subtracting by the second, we have that the value of y is obtained as follows:

24y - 8y = 230 - 94

16y = 136

y = 136/16

y = 8.5.

Then the value of x is obtained as follows:

5x + 12(8.5) = 115

x = (115 - 12 x 8.5)/5

x = 2.6.

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Answer:4

Step-by-step explanation:

Answer:

$7200

step by step Explanation:

Cameron borrowed $18,000 at an interest rate of 10% for a period of 4 years. To calculate the interest, we can use the simple interest formula: I = P * r * t, where I is the interest, P is the principal amount, r is the interest rate, and t is the time period.

Plugging in the values, we get I = 18,000 * 0.10 * 4 = $7,200. Therefore, Cameron paid a total of $7,200 in interest over the 4-year period.

We can expect the longest 20% of these scorpions to be above a length of approximately 2.0272 inches.

To find the value above which we could expect the longest 20% of these scorpions, we need to use the z-score formula. First, we need to find the z-score that corresponds to the 80th percentile, which is the complement of the top 20%. Using a standard normal distribution table or calculator, we find that the z-score corresponding to the 80th percentile is 0.84.

Next, we use the formula z = (x - mu) / sigma, where z is the z-score, x is the value we are trying to find, mu is the mean, and sigma is the standard deviation. We plug in the given values and solve for x:

0.84 = (x - 1.96) / 0.08

0.0672 = x - 1.96

x = 2.0272

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The table, we cannot determine the probability of a student participating in exactly two activities.

The probability distribution table is not provided in the question, but assuming that it is a valid probability distribution, we can use it to find the probability that a student participates in exactly two activities.

Let X be the random variable representing the number of extracurricular activities a college freshman participates in, and let p(x) denote the probability of X taking the value x.

Then, we want to find p(2), the probability that a student participates in exactly two activities. This can be obtained from the probability distribution table.

Without the table, we cannot determine the probability of a student participating in exactly two activities.

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36 is the number that satisfies the given condition.

Let's say your number is represented by the variable "x". According to the problem, when you subtract 16 from your number and multiply the difference by -3, the result is -60. We can translate this into an equation as follows:

-3(x - 16) = -60

To solve for x, we'll first simplify the left-hand side of the equation using the distributive property:

-3x + 48 = -60

Next, we'll isolate the variable x by subtracting 48 from both sides of the equation:

-3x = -108

Finally, we can solve for x by dividing both sides of the equation by -3:

x = 36

Therefore, if you subtract 16 from 36 and multiply the difference by -3, the result is -60:

-3(36 - 16) = -60

-3(20) = -60

-60 = -60

So 36 is the number that satisfies the given condition.

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Hi! It seems like you have a reduced row echelon form (RREF) matrix and you want to find the solution of the linear system using row operations. Based on the given augmented matrix:

(1  62  -5  | -2)
(0   0   2  | -8)
(0   0   0  |  1)

We can work from right to left, performing row operations to create a variable z.

Step 1: Since the third row has only one non-zero entry (1) in the last column, we can identify it as z:
z = 1

Step 2: Move to the second row and use the equation to solve for y:
2y = -8
y = -8 / 2
y = -4

Step 3: Move to the first row and use the equation to solve for x:
x + 62y - 5z = -2
x + 62(-4) - 5(1) = -2
x - 248 - 5 = -2
x = -2 + 248 + 5
x = 251

The solution to the linear system is x = 251, y = -4, and z = 1.

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The equation for the number of chocolates manufactured on a specific day is:

Chocolates(day) = 50 + 5 * (day-1)

The number of chocolates manufactured on day 7 = 80.

To find an equation for the number of chocolates manufactured on a specific day, we can use a linear interpolation method. The given data is:

Day:      1,  2,  3
Chocolates: 50, 65, 60

Step 1: Find the average increase in chocolates per day:
(65-50) + (60-65) = 15 - 5 = 10
The total increase is 10 over 2 days, so the average increase per day is 10/2 = 5 chocolates per day.

Step 2: Create a linear equation based on the initial value and the average increase:
Chocolates(day) = Initial chocolates + (Average increase * (day-1))
Chocolates(day) = 50 + 5 * (day-1)

Step 3: Find the number of chocolates manufactured on day 7:
Chocolates(7) = 50 + 5 * (7-1)
Chocolates(7) = 50 + 5 * 6
Chocolates(7) = 50 + 30
Chocolates(7) = 80

The equation for the number of chocolates manufactured on a specific day is Chocolates(day) = 50 + 5 * (day-1), and the number of chocolates manufactured on day 7 is 80.

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On doing the calculations according to the given direction the final answer we get is A1PRF0LL.

To complete this special assignment, follow these steps:

1. Write down a 3-digit number, so that the first and last digits differ by more than 1. For example 513.

2. Reverse the digits from step 1. In our example: 315.

3. Subtract the number from step 2 (315) from the number in step 1 (513), and write it as step 3. Result: 198.

4. Take the absolute value of the number from step 3 (198). Since it's already positive, the result is still 198.

5. Reverse the digits of the number from step 4 (198). Result: 891.

6. Add the numbers from steps 4 (198) and 5 (891). Result: 1089.

7. Multiply the number from step 6 (1089) by one million (add 6 zeros). Result: 1,089,000,000.

8. Subtract 244,716,484 from the number in step 7 (1,089,000,000). Result: 844,283,516.

9. Replace the digits in step 8 (844,283,516) with the corresponding letters or numbers:
  8 -> L, 4 -> 0, 2 -> F, 5 -> R, 1 -> P, 3 -> 1, 6 -> A, 7 -> M
  Result: L0LFRP1A.

10. Copy the result from step 9 (L0LFRP1A) backward. We will get A1PRF0LL.

Therefore, our final answer will be A1PRF0LL.

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a) The exponential function that models this situation is given as follows: C(t) = 7000(1.1)^t.

b) The cost when you are first eligible is found replacing the value of t by the number of years left for you to be eligible.

An exponential function has the definition presented as follows:

y = ab^x.

In which the parameters are given as follows:

The initial cost is of $7000, hence the parameter a is given as follows:

a = 7000.

After one year, the cost is of 7700, hence the parameter b is obtained as follows:

b = 7700/7000

b = 1.1.

Thus the function is:

C(t) = 7000(1.1)^t.

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The equation 2 - 3(x + 4) = 3(3 - x) has no solution for x

From the question, we have the following parameters that can be used in our computation:

2 - 3(x + 4) = 3(3 - x)

Open the brackets

So, we have

2 - 3x - 12 = 9 - 3x

Evaluate the like terms

So, we have

-10 = 9

The above equation is false

Hence, the equation has no solution

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