You need to spend exactly $1 and buy 40 stamps. There are 3
kinds of stamps that cost 1, 4, and 12 cents respectively. How many
stamps do you need to buy of each kind (if you have at least one of
each

To prove that \[ A^{n}=\left[\begin{array}{ccc} a^{n} & n a^{n-1} & \frac{n(n-1)}{2}a^{n-2} \end{array}\right], we will use mathematical induction.

Base case: For \( n=1 \), \( A^{1}=A \). This is true since
\[ A=\left[\begin{array}{ccc} a & 1 & 0 \\ 0 & a & 1 \\ 0 & 0 & a \end{array}\right] \]
which matches the left side of our equation.

Inductive step: Assume that the statement is true for some \( n=k \), i.e.
\[ A^{k}=\left[\begin{array}{ccc} a^{k} & ka^{k-1} & \frac{k(k-1)}{2}a^{k-2} \end{array}\right] \]
We will now show that it is true for \( n=k+1 \).
\[ A^{k+1}=A^{k}\cdot A \]

We substitute the induction hypothesis into this equation and get:
\[ A^{k+1}=\left[\begin{array}{ccc} a^{k} & ka^{k-1} & \frac{k(k-1)}{2}a^{k-2} \end{array}\right]\cdot \left[\begin{array}{ccc} a & 1 & 0 \\ 0 & a & 1 \\ 0 & 0 & a \end{array}\right] \]

Calculating the matrix product yields:
\[ A^{k+1}=\left[\begin{array}{ccc} a^{k+1} & (k+1)a^{k} & \frac{(k+1)k}{2}a^{k-1} \end{array}\right] \]
which matches the left side of our equation, completing the proof.

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The correct equation for the sentence is: 24 = 31.4n - 8.4.

Twenty-four is equal to 31.4 times a number plus a negative 8.4 multiplied by the proper equation, which is:

24 = 31.4n - 8.4

This formula can be rewritten as follows:

31.4n = 24 + 8.4

And after being distilled:

31.4n = 32.4

Finally, by multiplying both sides by 31.4, we can find the value of n:

n = 32.4/31.4

Thus, the following is the proper equation for the phrase:

24 = 31.4n - 8.4.

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The correct interval for the area of triangle PQR is 2 <= A < 4.

To find the correct interval for the area of triangle PQR, we first need to calculate the area using the given points. We can do this by using the formula for the area of a triangle in three dimensions:

A = (1/2) * sqrt((x2*y3 - x3*y2)^2 + (x3*y1 - x1*y3)^2 + (x1*y2 - x2*y1)^2)

Plugging in the given points for P, Q, and R, we get:

A = (1/2) * sqrt((1*3 - 3*0)^2 + (3*0 - 0*1)^2 + (0*0 - 1*3)^2)

Simplifying, we get:

A = (1/2) * sqrt(9 + 9)

A = (1/2) * sqrt(18)

A = (1/2) * 3 * sqrt(2)

A = (3/2) * sqrt(2)

A = 2.12

Therefore, the correct interval for the area of triangle PQR is 2 <= A < 4. The correct answer is option b. 2 <= A < 4.

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Answer:

A) $8

B) 4+2x

Step-by-step explanation:

If it costs $2 for every mile driven, and Huoa rides for 2 miles, then you multiply 2×2=4. Then you add another $4 for the $4 the driver charges for just getting in, so 4+4=8

Another way to do that is to use the equation that's the answer for part B. As you don't know the number of miles, you substitute that unknown number for x.

4+2x

The x represents the number of miles

The 2 represents the amount charged for each mile

The 4 represents the flat fee for getting into the car

If you plug 2 (for the 2 miles driven) into the equation you get:

4+2(2)

4+4

8

The percent increase of the puppy's weight is 25%

A puppy weighed 28 ounces on Monday

It gained 7 ounces in one week

Total weight is = 28 + 7

= 35

The percent increase can be calculated as follows

= 35/28

= 1.25

= 1.25-1

= 0.25 × 100

= 25%

Hence the percent increase of the puppy's weight is 25%

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The simplified expression is  [tex]12u^8[/tex].

What is simplification?

Simplifying an expression is just another way to say solving a math problem. When you simplify an expression, you're basically trying to write it in the simplest way possible. At the end, there shouldn't be any more adding, subtracting, multiplying, or dividing left to do. For example, take this expression: 4 + 6 + 5.

Here the given expression is ,

=> [tex]-2u^5(-6u^3)[/tex]

Now simplifying the expression,

=> [tex]-2\times -6 \times u^5 \times u^3[/tex]

=> 12[tex]u^{5+3}[/tex]

=> [tex]12u^8[/tex]

Hence the simplified expression is  [tex]12u^8[/tex].

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All sides of the given rhombus measure 5 cm respectively.

A rhombus is a quadrilateral with four equal-length sides in planar Euclidean geometry.

The term "equilateral quadrilateral" refers to a quadrilateral whose sides all have equal lengths.

Quadrilaterals having four congruent sides are called squares.

Squares are rhombuses by definition since they are quadrilaterals with four congruent sides.

So, consider the following values: AC = 8 cm, BD = 6 cm, OD = OB = 3 cm, and OA = OC = 4 cm.

Now,

OB² + OC² = BC²

3²+ 4² = BC²

9 + 16 = BC²

25 = BC²

5 = BC

A rhombus has an equal number of sides.

Therefore, all sides of the given rhombus measure 5 cm respectively.

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(3x²+18x)/(7x+21)  is the  simplified answer of  (x+6)/(3x+9)-:(7)/(9x)+42.

To divide the given expressions, we need to first simplify the expressions as much as possible and then use the rule for dividing fractions. The rule for dividing fractions is to multiply the first fraction by the reciprocal of the second fraction.

Simplifying the expressions:

(x+6)/(3x+9) = (x+6)/(3(x+3)) = (x+6)/3(x+3)

(7)/(9x) = 7/9x

Now, using the rule for dividing fractions:

((x+6)/3(x+3)) ÷ (7/9x) = ((x+6)/3(x+3)) * (9x/7)

= (9x(x+6))/(3(x+3)*7)

= (3x(x+6))/(x+3)*7

= (3x²+18x)/(7x+21)

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Answer:120

Step-by-step explanation:

The volume of the small can is  25.12 inches cube.

Mrs. Roberts' dog, Rover, loves to eat peanuts. A large can of peanuts has a diameter of 4 inches and a height of 6 inches. The small can that she plans to purchase has the same diameter but is 1/3 of the height of the large can.

Therefore, the approximate volume of the small can can be found as follows:

Hence,

volume of the small can = πr²h

where

Therefore,

r = 4 / 2 = 2 inches

h = 1 / 3 (6) = 2 inches

Hence,

volume of the small can = 3.14 × 2² × 2

volume of the small can = 3.14 × 4 × 2

volume of the small can = 3.14 × 8

volume of the small can = 25.12 inches cube

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The average rate of f(x), in [4,6], is equal to 20.

To find the average rate of change of a function over an interval, we use the formula:

Average rate of change = (f(b) - f(a))/(b - a)

Where f(x) is the function, a and b are the endpoints of the interval, and f(a) and f(b) are the values of the function at those endpoints.

In this case, our function is f(x) = 2x² - 9, and our interval is [4, 6]. So, we plug in the values into the formula:

Average rate of change = (f(6) - f(4))/(6 - 4)

First, we find f(6) and f(4):

f(6) = 2(6²) - 9 = 2(36) - 9 = 72 - 9 = 63

f(4) = 2(4²) - 9 = 2(16) - 9 = 32 - 9 = 23

Now we plug these values back into the formula:

Average rate of change = (63 - 23)/(6 - 4) = 40/2 = 20

In conclusion, the average rate is worth 20.

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The value of x from the exponential equation is x = 1/2

When you raise a quotient to a power you raise both the numerator and the denominator to the power. When you raise a number to a zero power you'll always get 1. Negative exponents are the reciprocals of the positive exponents.

The different Laws of exponents are:

mᵃ×mᵇ = mᵃ⁺ᵇ

mᵃ / mᵇ = mᵃ⁻ᵇ

( mᵃ )ᵇ = mᵃᵇ

mᵃ / nᵃ = ( m / n )ᵃ

m⁰ = 1

m⁻ᵃ = ( 1 / mᵃ )

Given data ,

Let the exponential equation be represented as A

Now , the value of A is

16ˣ = 4

On simplifying , we get

From the laws of exponents , we get mᵃ×mᵇ = mᵃ⁺ᵇ

So , 16ˣ = 4

when x = 1/2

16^(1/2) = 4

On further simplification , we get

√16 = 4

4 = 4

Therefore , the value of x is 1/2

Hence , the exponential equation is solved and the value of x = 1/2

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Jackie needs to pour 2/9of a quart of water from the first bottle to the second bottle to make them have the same amount of water.

Two or more expressions with an Equal sign is called as Equation.

Let us assume that we transfer an amount "x" from the first bottle to the second bottle.

This means that the first bottle will have 1-x quarts of water, while the second bottle will have 5/9 + x quarts of water.

Now, we want to find the value of "x" that makes both bottles have the same amount of water.

We can set up an equation:

1-x = 5/9 + x

We can then solve for "x" by adding "x" to both sides and subtracting 5/9 from both sides:

1 - 5/9 = 2x

4/9 = 2x

x = 2/9

Hence, Jackie needs to pour 2/9 of a quart of water from the first bottle to the second bottle to make them have the same amount of water.

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Answer:

The answer is  3

Elie Wiesel's quote speaks to the idea that human suffering is a universal concern and that we all have a responsibility to respond to it. It is a call to action for all of us to be aware of the suffering of others and to do what we can to alleviate it.

The quote "Human suffering anywhere concerns men and women everywhere" by Elie Wiesel in his book Night speaks to the idea that suffering is not an isolated event. Rather, it is something that affects all of humanity, regardless of where it occurs. This quote highlights the interconnectedness of humanity and the responsibility we all have to care for one another.

Wiesel, a Holocaust survivor, experienced unimaginable suffering during his time in concentration camps. Through his writing, he is able to convey the importance of recognizing and responding to the suffering of others. This quote serves as a reminder that we cannot turn a blind eye to the suffering of others, even if it is happening in a different part of the world.

In conclusion, Elie Wiesel's quote speaks to the idea that human suffering is a universal concern and that we all have a responsibility to respond to it. It is a call to action for all of us to be aware of the suffering of others and to do what we can to alleviate it.

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Answer:

Option d: Side OP is congruent to side RS.

To prove that ΔNOP ≅ ΔQRS by ASA, we need to show that:

1. ∠N ≅ ∠Q (given)

2. Side NP ≅ Side QS (given)

3. Side OP ≅ Side RS (additional information needed)

Hence, option d is the correct answer.

The variation constant is 22 and the equation of variation where y varies inversely as x is y = 22/x.

When two variables, y and x, are inversely proportional, it means that as one variable increases, the other variable decreases proportionally, and vice versa. Mathematically, this can be expressed as:

y = k/x

where k is the variation constant. To find k, we can use the given information that "y = 11 when x = 2". Substituting these values into the inverse variation equation above, we get:

11 = k/2

Multiplying both sides by 2, we get:

k = 22

So, the variation constant is 22.

Now, we can write the equation of variation as:

y = 22/x

This means that as x increases, y decreases proportionally. For example, if x doubles to 4, y would be halved to 5.5, keeping the product (xy) constant.

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(9)/(8)+(4)/(-3) =  (5)/(-24)

A. To add the fractions (9)/(8) and (4)/(-3), we need to find a common denominator. The common denominator of 8 and -3 is -24.

So, we will multiply the numerator and denominator of the first fraction by -3 and the numerator and denominator of the second fraction by 8. This will give us:

(-3)(9)/(-3)(8) + (8)(4)/(8)(-3)

B. Simplifying the numerators and denominators gives us:

(-27)/(-24) + (32)/(-24)

Now, we can add the numerators and keep the common denominator:

(-27 + 32)/(-24)

Simplifying the numerator gives us:

(5)/(-24)

Finally, we can simplify the fraction by dividing the numerator and denominator by their greatest common factor, which is 1:

(5/1)/(-24/1)

This gives us the final answer of:

(5)/(-24)

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Answer: 2

Step-by-step explanation:

Answer and Explanation: The only even number that is not a composite number is 2. All even numbers are defined as numbers that are divisible by, or have a divisor of, 2.

Answer:

The answer to your question is, 2

Step-by-step explanation:

The reason why that is our answer is because, 2 can either be multiplied and divided but 2 NUMBERS.

Such as the following:

2 / 1 = 2.

1 x 2 = 2.

What is a composite number?

A composite number are numbers that have more than two factors like the number 2:

2 / 1 = 2.

1 x 2 = 2.

Thus the answer to your problem is, 2

Answer:

The formula for calculating the amount of money in an account with continuous compounding is:

A = Pe^(rt)

Where:

A = the amount of money in the account after t years

P = the principal amount (initial investment)

r = the annual interest rate (as a decimal)

t = the time (in years)

Substituting the given values into the formula, we get:

A = 7500e^(0.0158)

A ≈ $9,071.21

Therefore, to the nearest hundred dollars, there would be $9,100 in the account after 8 years.

Step-by-step explanation:

The coordinates (x,y) to sketch the graph is mentioned below. (b) The intercepts of the graph represent the situations where one of the items is not purchased.

A graph is a visual representation of data that shows the relationship between variables. It consists of a set of points or vertices, connected by lines or curves called edges or arcs. Graphs are commonly used in mathematics, statistics, and other fields to display information in a way that is easy to understand and interpret.

a) To sketch the graph, we can create a table of values for the equation 5x + 3y = 30:

Bags of Popcorn (x) Drinks (y) Total Cost

0                                          10          30

1                                          8          30

2                                          6          30

3                                          4          30

4                                          2          30

6                                          0          30

Then we can plot the points from the table on a graph with the number of bags of popcorn on the x-axis and the number of drinks on the y-axis. Connecting the points gives us a line that represents all possible combinations of bags of popcorn and drinks that cost $30.

b) The intercepts of the graph represent the situations where one of the items is not purchased. The x-intercept (0,10) represents the situation where no bags of popcorn are purchased, so all $30 is spent on 10 drinks. The y-intercept (6,0) represents the situation where no drinks are purchased, so all $30 is spent on 6 bags of popcorn. The slope of the line represents the rate at which the cost of one item changes relative to the cost of the other item. In this case, the slope is -5/3, which means that for each bag of popcorn purchased, the cost of drinks decreases by $5/3.

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Answer:

the answer is "c"! :)

Step-by-step explanation:

Answer:

∠F = 19.5

Step-by-step explanation:

180 - 127 - 33.5 = 19.5

The side x is 30 miles

The unknown side is 346 yards

The sine rule, also known as the law of sines, is a formula that relates the sides and angles of a non-right triangle (a triangle that does not have a 90-degree angle). The sine rule states that the ratio of the length of a side of a triangle to the sine of the opposite angle is the same for all three sides of the triangle.

1) Using the sine rule;

x/sin 65 = 32/sin75

xsin75 = 32sin65

x = 32sin65/sin75

x = 30 miles

2) The angle = π/3 = 180/3 = 60 degrees

Using the cosine rule;

c^2 = (200)^2 + (400)^2 - (2 * 200 * 400) cos 60

c^2 = 200,000 - 80,000

c = 346 yards

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The answer would be 51,998

The coordinates of point D are (-2,5) and the points given have been plotted. The solution has been obtained by using the distance formula.

What is distance formula?

The distance between two points can be calculated using the xy-plane distance formula.

We are given that ABCD should form a rectangle.

We know that opposite sides of a rectangle are equal.

So, AB = CD

Using the distance formula which is

d = √(x₂ - x₁)² + (y₂ - y₁)²

We get

⇒AB = √(3 - (-6))² + (-8 - (-4))²

⇒AB = √(3 + 6)² + (-8 + 4)²

⇒AB = √(9)² + (-4)²

⇒AB = √81 + 16

⇒AB = √97        ...(1)

Let the coordinates of Point D be (x, y)

So, similarly

⇒CD = √(x - 7)² + (y - 1)²   ...(2)

On equating (1`) and (2), we get

⇒√97 = √(x - 7)² + (y - 1)²

On squaring both sides, we get

⇒97 = (x - 7)² + (y - 1)²

⇒97 = x² + 49 - 14x + y² + 1 - 2y

⇒97 = x² + 50 - 14x + y² - 2y

⇒47 = x² - 14x + y² - 2y       ...(3)

Also, AC = BD as these are the opposite sides of the rectangle.

Using the distance formula, we get

⇒AC = √(7 - (-6))² + (1 - (-4))²

⇒AC = √(7 + 6)² + (1 + 4)²

⇒AC = √(13)² + (5)²

⇒AC = √169 + 25

⇒AC = √194     ...(4)

Similarly,

⇒BD = √(x - 3)² + (y - (-8))²

⇒BD = √(x - 3)² + (y + 8)²        ...(5)

On equating (4`) and (5), we get

⇒√194 = √(x - 3)² + (y + 8)²  

On squaring both sides, we get

⇒194 = (x - 3)² + (y + 8)²  

⇒194 = x² + 9 - 6x + y² + 64 + 16y

⇒194 = x² + 73 - 6x + y² + 16y

⇒121 = x² - 6x + y² + 16y    ...(6)

On subtracting (3) and (6), we get

8x + 18y = 74

On dividing by 2, we get

4x + 9y = 37

From this, we get

x = (37 - 9y) / 4

Substituting this in (3), we get

⇒47 = [(37 - 9y) / 4]² - [14 * [(37 - 9y) / 4]] + y² - 2y

On solving this, we get

y = 5

On substituting this in x, we get

x = (37 - 9(5)) / 4

x = (37 - 45) / 4

x = -8 / 4

x = -2

Hence, the coordinates of point D are (-2,5) and the points given have been plotted.

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A $900 item on the sale of 20% discount the

Money off: $180

Amt. of tax: $50.40

Money paid: $770.40

Final price: $770.40

what is discount ?

A discount is a reduction in the price of an item or service, often offered as a promotion or incentive to encourage customers to make a purchase. The discount is usually expressed as a percentage of the original price and represents the amount of money that the customer can save on the purchase.

For example:

Percentage discount: a certain percentage of the original price is deducted from the selling price. For example, a 20% discount on a $100 item would reduce the price to $80.

According to the question:
To calculate the final price of the item with sales tax, we can follow these steps:

Calculate the amount of money off by multiplying the original price by the discount percentage:

Money off = 0.20 x $900 = $180.

Calculate the price after the discount by subtracting the money off from the original price:

Price after discount = $900 - $180 = $720.

Calculate the amount of sales tax by multiplying the price after discount by the tax rate:

Amount of tax = 0.07 x $720 = $50.40.

Calculate the money paid by adding the price after discount and the amount of tax:

Money paid = $720 + $50.40 = $770.40.

Therefore, the final price with 7% sales tax is $770.40.

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Answer: $89

Step-by-step explanation:

to find average add up all numbers and divide by how many there are

so, do

(125+110+95+80+70+54)/6

which equals 89

Answer:

1.  c

2. b

3.  a

Step-by-step explanation:

Surface Area of a cylinder = 2πrh + 2πr²

1.  2(3.14)(5)(11) + 2(3.14)(5)² = 502.4

2. 2(3.14)(6)(10) + 2(3.14)(6)² = 602.88

3.  2(3.14)(2)(12) + 2(3.14)(2)² = 175.84

The final simplified expression turns out to be "-8x^2 + 6x - 6"

To perform the addition or subtraction and simplify the expression, we need to combine like terms and simplify the expression. First, we need to subtract the second expression from the first one:

x^2 + x − 2 - (9x^2 − 5x + 4)

Next, we need to distribute the negative sign to each term in the second expression:

x^2 + x − 2 - 9x^2 + 5x - 4

Now we can combine like terms:

-8x^2 + 6x - 6

This is the simplified expression. Therefore, the answer is:

-8x^2 + 6x - 6

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