(a) Factorise 25t²₋ 4
(b) Factorise x²₋6x₋3xy₊18y

We cannot use arccos (28/53) and arcsin (28/53) because they correspond to angle B, not angle A. Similarly, arctan (28/45) and arctan (45/28) do not give the measure of angle A.

The cosine function has an opposite known as the arccos function. It provides the angle whose cosine is the specified value. Try it. Drag any vertex of the triangle and watch how the angle C is determined using the arccos() function. Meaning: A 30 degree angle is one whose cosine is 0.866.

The inverse cosine function is the arccosine. The arccosine function's input values range from -1 to 1, matching the cosine function's output range of -1 to 1. So, for x=2, arccos x is undefined.

From the given figure, we can see that:

cos A = 28/53

sin A = 45/53

Therefore, the expressions that give the measure of angle A are:

(B.) arccos (45/53)

(D.) arcsin (45/53)

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The shipping arrangement which minimizes costs will be 1.5x + 1.2y + 0.8z + 1.1(240 - x - y - z) subject to

x + z + s1 = 160

y + (240 - x - z) + s2 = 90

x - 100 + s3 = 0

y - 140 + s4 = 0

The minimum cost is $372.00.

There will be product left in either warehouse after fulfilling the orders.

Let x be the number of sheets delivered from the north-side warehouse to Customer A,

Let y be the number of sheets delivered from the north-side warehouse to Customer B and z be the number of sheets delivered from the south-side warehouse to Customer A.

Then the objective function to be minimized is:

1.5x + 1.2y + 0.8z + 1.1(240 - x - y - z).

There will be 60 sheets of drywall board left in the north-side warehouse and 70 sheets left in the south-side warehouse after fulfilling the orders.

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Water pours into a fish tank at a rate of 0.3 cubic meters per minute, the water level is rising at a rate of 1/60 m/min

Given

Let, h is the height of the water level in the fish tank after t minutes. Then, the volume of the water in the fish tank after t minutes is given by [tex]V = Area of the base * height V = 6 * h m^3[/tex]The rate at which water pours into the fish tank is 0.3 cubic meters per minute.

Therefore, the rate of change of volume of the water in the fish tank after t minutes is [tex]dV/dt = 0.3 m^3/min[/tex]. As per the chain rule of differentiation,[tex]dV/dt = dV/dh *dh/dt[/tex] We have[tex]V = 6h^3m^3 \Rightarrow  dV/dh = 18h^2\Rightarrow  dV/dt = 18h^2 * dh/dt[/tex] Given that,[tex]dV/dt = 0.3 m^3/min[/tex]. Therefore,[tex]0.3 = 18h^2 * dh/dt \Rightarrow  dh/dt = 0.3/18= 1/60 m/min[/tex] Hence, the water level is rising at a rate of 1/60 m/min.

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Therefore, the measure of ∠D is approximately 60.96 degrees.

A measure is a function that assigns a number to each set in a given space, typically with the goal of describing the size or extent of the set. For example, the Lebesgue measure is a way of assigning a "volume" to sets in n-dimensional Euclidean space.

by the question.

To find the measure of ∠D in a right triangle with sides of 25 feet and 45 feet, we can use the inverse tangent function:

[tex]tan(∠D) = opposite/adjacent = CD/BC = 45/25[/tex]

Taking the inverse tangent of both sides, we get:

[tex]∠D = tan⁻¹(45/25) = 60.95 degrees[/tex]

Rounding this to the nearest hundredth, we get:

[tex]angleD = 60.95 degrees =60.96 degree.[/tex]

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The radius of the cylinder is 3 inches.

What is the volume of a cylinder?

A cylinder is a three-dimensional solid with two parallel circular bases and a curved lateral surface connecting the two bases. The volume of a cylinder is given by the formula [tex]V = \pi r^2h[/tex], where r is the radius of the base, h is the height of the cylinder, and π is a constant value approximately equal to 3.14.

Calculating the value of radius :

We are given that the cylinder has a volume of 45 cubic inches and a height of 5 inches. Using the formula for the volume of a cylinder, we get:

[tex]V = \pi r^2h[/tex]

Substituting the given values, we get:

[tex]45 = \pi r^2(5)[/tex]

Simplifying the equation, we get:

[tex]9 = r^2[/tex]

Taking the square root of both sides, we get:

[tex]r = \pm 3[/tex]

Since the radius cannot be negative, we take the positive value of r, which is:

r = 3 inches

Therefore, the radius of the cylinder is 3 inches.

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Based on exponential growth function, the explicit expression that represents the population of Belvedere, which was estimated to be 39,366 in 2020 with an annual increase of 2.8%, in the next 6 years is D. 39,366(1.028)^6.

An exponential growth function is one of the two exponential function, including exponential decay function.

The exponential growth function is given as y = a(1 + r)^t, where:

Population of Belvedere in 2010 = 39,366

Annual rate of increase = 2.8%

The time, t = 6 years

Exponential function expression: 39,366(1.028)^6

Thus, the population of the city in the next 6 years can be represented by  the expression in Option D.

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Eva has 36 different combinations of camping gear to choose from.

Combinations are arrangements of a given set of objects, without regard to their order. Combinations are used in mathematics to describe the possible arrangements of a given set of objects.

In this case, there are 3 sleeping bags, 2 pillows, and 6 tents. In order to determine the total number of combinations, Eva would need to multiply 3x2x6 which equals 36.

If she decides to pick a sleeping bag first, then she can pick any of the 3 available sleeping bags. She would then need to pick one of the 2 pillows and one of the 6 tents. If the order in which she selects her gear does not matter, then she can use the same method to determine the number of combinations available.

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The number of ways in which Eva can pick a set of camping gear that includes one of each item is 55.

Combination involves selecting items from a set of items without regard to the order in which they are selected. It is typically expressed using the notation C(n,r) which stands for the number of combinations of n items taken r at a time, where n is the total number of items and r is the number of items taken at a time.

This is an example of a combination problem, as Eva is looking to select a set of items from multiple categories, rather than a permutation problem, which would be selecting a set of items where the order matters.

In this case,

n= 6 (the number of tents)+ 3 (the number of sleeping bags)+ 2 (the number of pillows)= 11.

We want to choose 1 of each item, so r is 3.

Plugging 11 and 3 into the formula, we get

11C3 = 11! / (3! * 8!)

= 11 * 10 * 9 / (3 * 2 * 1)

= 11 * 5

= 55

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Assuming each spider has 8 legs, it would take 877,256 legs to make 109,657 spiders

This probability that a randomly selected student from the classroom doesn't really play an item is , which equals  or .

Probability is the possibility of something occurring to occur, to clarify. We may talk about the possibility with one result, or the likelihood of several outcomes, when we don't understand how an occurrence will turn out. Biostatistics seems to be the study of things with a probability distribution.

The number one is known as the ace and is denoted by the letter A in the majority of Western card games. The ace scores highest, surpassing even the king, in games predicated on the supremacy of one level over the other, such as the majority of trick-taking games.

The total of a number of masculine and female pupils involved in sports [tex]$\mathrm{20}+10=30$[/tex] represents the total amount of pupils that don't play an instrument.

The sum of the four numbers in the table, [tex]$12+20+18+10$[/tex] , corresponds to the total amount of pupils in the class, or 60 .

So, [tex]$30/60=1/2\ \mathrm{Or}\ 0.5$[/tex] or  is the likelihood that a randomly selected student from of the class doesn't really play an instrument.

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Complete question:

If at practice, each player shoots 20 free throws, the standard deviation of x is 0.975.

To calculate the standard deviation of x, we need to first determine the variance. The variance is the average of the squared differences of each observation from the mean.

In this case, Faith is a 95% free throw shooter, so she is expected to make 19 out of 20 shots on average. The probability of making a free throw is 0.95, and the probability of missing a free throw is 0.05. Therefore, the mean of x is:

mean(x) = 20 * 0.95 = 19

To calculate the variance, we need to find the expected value of (x - mean(x))^2. Since Faith's free throw shooting is independent, we can use the binomial distribution to find the probability of making x shots out of 20.

The formula for the variance of a binomial distribution is np(1-p), where n is the number of trials and p is the probability of success. Therefore, the variance of x is:

var(x) = 20 * 0.95 * 0.05 = 0.95

Finally, the standard deviation is the square root of the variance:

sd(x) = √(var(x)) = √(0.95) = 0.975

This means that on average, Faith is expected to make 19 out of 20 free throws, but there is a standard deviation of 0.975, which indicates the degree of variability or spread around the mean. In other words, we can expect Faith to make between 18 and 20 free throws in most cases, but there is a small chance that she may make fewer or more than that.

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Answer:

-4

Step-by-step explanation:

substitute -2 into the formula and solve

[tex]f(x)=(-2)^2+3(-2)-2\\f(x)=4+(-6)-2\\\boxed{f(x)=-4}[/tex]

Answer:

30 minutes

Step-by-step explanation:

Use ratios. This is an inverse function, as speeding up makes the time traveling go down. So, when dividing the speed by 3 (done so 15 can get to 5), we multiply the time traveled by 3.

10 minutes * 3 = 30 minutes

The eigenvalues of A are λ = 0 (with multiplicity 1) and λ = 5 (with multiplicity 2), and the corresponding eigenvectors are [1, 0, -1], [0, 1, -1], and [1, -1, 1].

The matrix A = [5 5 5; 5 5 5; 5 5 5] is a 3x3 matrix with all entries equal to 5.

First, we can calculate the determinant of A - λI, where I is the identity matrix and λ is an unknown eigenvalue:

A - λI = [5-λ 5 5; 5 5-λ 5; 5 5 5-λ]

det(A - λI) = (5-λ)[(5-λ)(5-λ)-25] - 5[5(5-λ)-25] + 5[5-25]

= (5-λ)(λ^2 - 15λ) = -λ(λ-5)^2

From this equation, we can see that the eigenvalues are λ = 0 and λ = 5 (with multiplicity 2).

To find the eigenvectors, we can substitute each eigenvalue into the equation (A - λI)x = 0 and solve for x.

For λ = 0, we have:

A - 0I = A = [5 5 5; 5 5 5; 5 5 5]

(A - 0I)x = 0x = [0 0 0]

This implies that any vector of the form [a, b, -a-b] is an eigenvector for λ = 0. For example, we can choose [1, 0, -1] and [0, 1, -1] as linearly independent eigenvectors corresponding to λ = 0.

For λ = 5, we have:

A - 5I = [0 5 5; 5 0 5; 5 5 0]

(A - 5I)x = 0

⇒ 5x2 + 5x3 = 0

⇒ 5x1 + 5x3 = 0

⇒ 5x1 + 5x2 = 0

This implies that any vector of the form [1, -1, 1] is an eigenvector for λ = 5. Therefore, we can choose [1, -1, 1] as another linearly independent eigenvector corresponding to λ = 5.

Eigenvectors are a fundamental concept in linear algebra. They are essentially special vectors that remain in the same direction when a linear transformation is applied to them, only changing in magnitude. In other words, an eigenvector of a linear transformation is a vector that when multiplied by the transformation matrix, results in a scalar multiple of itself.

Eigenvectors play a crucial role in diagonalizing matrices, which can simplify calculations involving matrix operations. They are also useful for solving differential equations and understanding the behavior of dynamic systems. In addition, eigenvectors are often used for data analysis, such as in principal component analysis (PCA), which is a technique for reducing the dimensionality of data.

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It took 25 hours and 48 minutes employee worked for the week. Thus, option B is correct.

A timesheet is a data table which an emplοyer can use tο track the time a particular emplοyee has wοrked during a certain periοd. Businesses use timesheets tο recοrd time spent οn tasks, prοjects, οr clients. There are different methοds that have been used tο recοrd timesheets, such as paper, spreadsheet sοftware, and οnline time-tracking sοftware. Paper-based timesheets have nοw given way tο the digital fοrmats.

1st Day = 12 + 4 pm - 8:45 am

             = 16 - 8:45

              = 7:15 hours

2nd day = 12 + 5 pm - 9:14 am

              = 17 - 9:14

              = 7:46 hours

3rd day = 12 + 4:02 pm - 8:30 am

              = 16:02 - 8:30

              = 7:32 hours

4th day  = 12 + 5:00 pm - 9:08am

              = 17:00 - 8:30

              = 8:30 hours

5th day  = 12 + 3:30 pm - 8:07 am

              = 15:30 - 8:07

              = 7:23 hours

Adding all the hours of work =  7:15 hours + 7:46 hours +7:32 hours + 8:30 hours + 7:23 hours =  25 hours and 48 minutes

Thus, It took 25 hours and 48 minutes employee worked for the week. Thus, option B is correct.

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Using the property of a kite: the angles formed by two unequal sides of a kite are equal. The value of ∠BCD∠BCD is

∠BCD = ∠BAD ⇒ ∠BCD = 106°  

Answer:

When the radius of a circle is increasing while the magnitude of a central angle is held constant, the length of the intercepted arc is also increasing.

To see why this is the case, let's consider the formula for the length of an arc, which is given by:

s = rθ

where s is the length of the intercepted arc, r is the radius of the circle, and θ is the central angle in radians.

If the radius is increasing but the magnitude of θ is held constant, then the length of the intercepted arc will increase as well. This is because s is directly proportional to r; as r increases, s will also increase.

To see this more concretely, imagine drawing a circle on a piece of paper with a certain radius and then drawing a central angle that intercepts a certain arc length. If we then increase the radius of the circle while keeping the central angle the same, the arc length will increase proportionally to the increase in radius. This is because the same central angle will now subtend a larger arc on the circle, since the circle is larger.

Therefore, when the radius of a circle is increasing while the magnitude of a central angle is held constant, the length of the intercepted arc is increasing as well.

Step-by-step explanation:

1) The mean of the random sampling distribution of means is the same as the sample mean ($1068.86).

2) The standard error of the random sampling distribution of means is calculated by taking the population standard deviation ($777.50) divided by the square root of the sample size (100), which yields $7.78.

3) The z statistic for the average cost of an apartment rental is calculated by subtracting the population mean ($1225.15) from the sample mean ($1068.86) and dividing the difference by the standard error ($7.78), yielding -37.37.

4) The probability of finding an apartment rental with an average cost of $1068.86 or less is determined by looking up the z statistic in a z table and finding the corresponding probability, which is 0.000.

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Answer:

To write the equation of a circle given its center and a point on the circle, we need to use the standard form of the equation of a circle, which is:

(x - h)^2 + (y - k)^2 = r^2

where (h, k) is the center of the circle and r is the radius.

Let's use point A as the point on the circle. We are given that the center of the circle is (4, -2) and point A is (6, 1). We can use the distance formula to find the radius of the circle:

r = √[(6 - 4)^2 + (1 - (-2))^2] = √[4^2 + 3^2] = 5

Now we can substitute the center and radius into the standard form equation:

(x - 4)^2 + (y + 2)^2 = 5^2

Simplifying and expanding the right-hand side, we get:

Therefore, the equation of the circle is (x - 4)^2 + (y + 2)^2 = 25 and we used point A to find it.

     |-----|-----|-----|----|-----|-----|--│--|-----|----|-----|

    -5   -4   -3   -2   -1    0    1   │  2    3    4    5

                                            1 1/2

On this number line, the tick mark labeled "1 1/2" is located halfway between the integer values of 1 and 2.

To represent the number 1 1/2 on a number line, we need to draw a horizontal line with evenly spaced tick marks. Each tick mark represents a specific value on the number line. Since 1 1/2 is a mixed number that includes a whole number (1) and a fraction (1/2), we need to locate it between the integer values of 1 and 2. The tick mark for 1 1/2 should be halfway between these two integers, which means it would be located at the midpoint of the line segment that connects the tick marks for 1 and 2. By placing the tick mark for 1 1/2 in the correct position on the number line, we can accurately represent this number visually.

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The sequence of the questions is [tex]J/9[/tex] when you multiply [tex]J[/tex] by [tex]9[/tex] and the quotient by [tex]2[/tex].

In this example, the number being divided (15) is known as the result, and the number being divided by (3 in this instance) is known as the divisor. The quotient is the outcome of the division.

The result of dividing two integers is known as the quotient. Six divided into two results in the number three. Latin's "how many times" is the meaning of the word "quotient." It makes perfect sense: by dividing two numbers, you can determine "how many time" the two digits enters the first.

[tex]2 * (J/9)[/tex]

This means you first divide [tex]J[/tex] by [tex]9[/tex] to get the quotient, and then multiply the quotient by [tex]2[/tex]. So the order of operations is:

[tex]J/9[/tex]

Multiply the quotient by [tex]2[/tex]

For example, if [tex]J = 45[/tex], then:

[tex]J/9 = 45/9 = 5[/tex]

[tex]2 * (J/9) = 2 * 5 = 10[/tex]

So the result of multiplying [tex]J[/tex] by [tex]9[/tex] and then multiplying the quotient by [tex]2[/tex], when [tex]J = 45[/tex], is [tex]10[/tex].

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When the area is constant, the proportionality constant, 48, reflects the sum of the base and height.

When two quantities grow and shrink at the same rate, they are directly proportional. The proportionality constant k is defined as k=y/x when y and x are two numbers that are directly proportional to one another.

Using the formula for the area of a rectangle, we can determine the missing data in the table:

Area = base x height

The missing values can be located as follows using the values listed in the table:

Base (b) Height (h) Area

24 2 48

3 8 24

8 3 24

4 6 24

We can apply the inverse variation formula to find the constant of proportionality:

y = k/x

This equation can be changed in order to account for k:

k = xy

Using any pair of values from the table, we can find k as follows:

k = xy = 24(2) = 48

Hence, 48 is the proportionality constant. It is possible to verify that this value applies to all of the value pairs in the table:

For the first pair (b=24, h=2), we have xy = 24 x 2 = 48, which is the constant of proportionality.

For the second pair (b=3, h=8), we have xy = 3 x 8 = 24, which is the area.

For the third pair (b=8, h=3), we have xy = 8 x 3 = 24, which is the area.

For the fourth pair (b=4, h=6), we have xy = 4 x 6 = 24, which is the area.

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Question:

The following table shows some values ​​for the base and height of a rectangle whose area is constant. Write down the missing data.

Base (b)

Height (h)

24

2

3

8

4

4

What is the area of ​​the rectangle?

What kind of variation do you see in this table?

What is the constant of proportionality?

How did you determine the constant of proportionality?

Answer:

The roots are

[tex]x=-2+\dfrac{3}{2} \ i \ \ or \ \ x=-2-\dfrac{3}{2} \ i[/tex]

Step-by-step explanation:

4x² + 16x + 25 = 0

Using the quadratic formula

That's

[tex]x=\dfrac{-b\pm\sqrt{b^2-4ac} }{2a}[/tex]

From the question

a = 4 , b = 16 , c = 25

Substitute the values into the above formula and solve

We have

[tex]x=\dfrac{-16\pm\sqrt{16^2-4(4)(25)} }{2(4)}[/tex]

[tex]x=\dfrac{-16\pm\sqrt{256-400} }{8}[/tex]

[tex]x=\dfrac{-16\pm\sqrt{-144} }{8}[/tex]

[tex]x=\dfrac{-16\pm12 \ i}{8}[/tex]

Separate the real and imaginary parts

That's

[tex]x=\dfrac{-16}{8}\pm\dfrac{12}{8} \ i[/tex]

[tex]x=-2\pm\dfrac{3}{2} \ i[/tex]

We have the final answer as

[tex]x=-2+\dfrac{3}{2} \ i \ \ or \ \ x=-2-\dfrac{3}{2} \ i[/tex]

Hope this helps you

The rule that applies here is the addition rule of probability, which states that the probability of the union of two events A and B is the sum of their individual probabilities minus the probability of their intersection

The probability of choosing a red card or a king from a deck of 52 cards is 8/52 or 2/13. To calculate this, we first need to determine the number of cards that are either red or a king. There are 26 red cards in a deck of 52 cards, so the probability of choosing a red card is 26/52 or 1/2. There are four kings in a deck of 52 cards, so the probability of choosing a king is 4/52 or 1/13.

However, we need to be careful to avoid counting the red kings (two of which exist in a deck of 52 cards) twice. To account for this, we subtract the probability of choosing a red king from the sum of the probabilities of choosing a red card and a king. The probability of choosing a red king is 2/52 or 1/26, so the probability of choosing a red card or a king is:

P(red card or king) = P(red card) + P(king) - P(red king)
P(red card or king) = 26/52 + 4/52 - 2/52
P(red card or king) = 28/52
P(red card or king) = 2/13

The rule that applies here is the addition rule of probability, which states that the probability of the union of two events A and B is the sum of their individual probabilities minus the probability of their intersection (i.e., the probability that they occur jointly).

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Step-by-step explanation:

(x-3)²-(x-3)²

=(x2-6x+9) - (x2-6x+9)

=x2-6x+9-x2+6x-9

=0

Answer: 844344.55555