I need help on 8 and 9!!

Area of rectangle with sides a and b is ab.

We have one side x and area 100 m².

Therefore the second side is:

The perimeter is:

Proved

Given:

Area of rectangular pen = 100 m²

Lenth of one side of pen (a) = x m

To prove:

Perimeter (P) = 2x + 200/x

Least perimeter = 40 m

Solution:

Area of rectangle = ab

100 = x. b

b = 100/x

Perimeter= 2(a +b)

P = 2a + 2b

P = 2x + 2× 100/x

P = 2x + 200/x

To prove the least perimeter differentiate the perimeter P w.r.t. x,

dp/dx = 2 - 200/x²

Now equate the above function with zero,

2-200/x² = 0

200/x² = 2

x² = 100

x = ± 10

x = -10 is not valid as length can not be negative.

substitute x = 10, in parent function

P = 2x + 200/x

P = 2×10 + 200/10 = 20 + 20 = 40

Hence proved

P (Least perimeter) = 40

You can't drink salt water as it leads to dehydration and damage to our organs due to the high concentration of salt.

Drinking salt water can be a potentially deadly mistake because of a phenomenon called osmosis. Osmosis is the movement of water molecules across a semi-permeable membrane, from an area of low solute concentration to an area of high solute concentration.

When we drink salt water, we introduce a high concentration of salt into our bodies. This high concentration of salt draws water out of our cells and tissues, causing dehydration. This is because our bodies require water to dilute the salt concentration and maintain a balance of solutes both inside and outside the cells.

The more salt water a person drinks, the greater the concentration of salt in their body becomes, leading to an increased loss of water through osmosis. This can lead to a vicious cycle where the more a person drinks salt water, the more dehydrated they become, thus damaging the organs of the person.

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The linear dependence between the vectors is -3[10 02] + 1[21 3−1] + 2[11 3−3] = 0.

The linear dependence between the following vectors in Mat 2×2 (R) [10 02],[21 3−1],[11 3−3] can be found by solving the equation a[10 02] + b[21 3−1] + c[11 3−3] = 0 for a, b, and c. This gives us the following system of equations:10a + 21b + 11c = 02a + 3b + 3c = 02b - c = 0Solving this system of equations, we get a = -3, b = 1, and c = 2. Therefore, the linear dependence between the vectors is -3[10 02] + 1[21 3−1] + 2[11 3−3] = 0. This means that the vectors are linearly dependent and can be written as a linear combination of each other.

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By trigonometric formulas, there are two solution sets for the trigonometric equation 2 · cos β = - √(3 · cos β) + sin β + 2 · cos β: β₁ ≈ 0.402π + 2π · k, β₂ = - 0.402π - 2π · k, where k is an integer.

In this problem we find the case of a trigonometric equation, whose roots must be found by algebra properties and trigonometric formulas. First, write the complete expression:

2 · cos β = - √(3 · cos β) + sin β + 2 · cos β

Second, simplify the expression by algebra properties:

√(3 · cos β) = sin β

Third, square both sides and simplify the expression:

3 · cos β = sin² β

3 · cos β = 1 - cos² β

cos² β + 3 · cos β - 1

Fourth, factor the resulting expression:

(cos β - 0.303) · (cos β + 3.303)

Fifth, determine the set of solutions:

cos β = 0.303

β₁ ≈ 0.402π + 2π · k, β₂ = - 0.402π - 2π · k, where k is an integer.

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The final answer is 0.857 gallons of the 12% solution and 1.143 gallons of the 26% solution.

To find how much of a 12% salt solution must be combined with a 26% salt solution to make 2 gallons of a 20% salt solution,

We can use the equation:

x(12%) + (2 - x)(26%) = 2(20%)

where x is the amount of the 12% solution needed.

Simplifying the equation gives us:

12x + 52 - 26x = 40

-14x = -12

x = 0.857 gallons

Therefore, we need 0.857 gallons of the 12% salt solution and 1.143 gallons of the 26% salt solution to make 2 gallons of a 20% salt solution.

Answer: 0.857 gallons of the 12% solution and 1.143 gallons of the 26% solution.

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(a) Stratified random sampling ensures a representative sample, and Ys is an unbiased estimate of the population mean y.

(b) Proportional allocation allocates sample size in each stratum proportionally to its size, while optimum allocation determines sample size based on variance and cost in stratified random sampling.

(a) Stratified random sampling is a method of sampling that involves dividing the population into smaller groups or strata, and then randomly selecting a sample from each stratum. This is done to ensure that the sample is representative of the population as a whole. The formula for the expected value of the sample mean, E(Ys), in stratified random sampling is:
E(Ys) = Σ wi * E(Yi)
where wi is the weight of the ith stratum, and E(Yi) is the expected value of the sample mean in the ith stratum.
Since Ys is an unbiased estimate of the population mean y, we can prove that E(Ys) = y by substituting y for E(Yi) in the formula:
E(Ys) = Σ wi * y
= y * Σ wi
= y * 1
= y
Therefore, E(Ys) = y, proving that Ys is an unbiased estimate of the population mean y.

(b) Proportional allocation is a method of allocating the sample size in stratified random sampling, where the sample size in each stratum is proportional to the size of the stratum in the population.

This ensures that each stratum is represented in the sample in proportion to its size in the population.

Optimum allocation is another method of allocating the sample size in stratified random sampling, where the sample size in each stratum is determined based on the variance of the stratum and the cost of sampling from the stratum.

This ensures that the sample size in each stratum is optimized to minimize the variance of the sample mean and the cost of sampling.

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Solution:

The possible rational zeros of [tex]f(x) = 5x^(4) - 9x^(3) - 7x^(2) + 9x - 2[/tex] are [tex]±1, ±2, ±1/5, and ±2/5.[/tex]

According to the Rational Zeros Theorem, the possible rational zeros of a polynomial function are the ratios of the factors of the constant term to the factors of the leading coefficient. In this case, the constant term is -2 and the leading coefficient is 5.

The factors of -2 are ±1 and ±2. The factors of 5 are ±1 and ±5. So, the possible rational zeros are:

[tex]±1/1, ±2/1, ±1/5, ±2/5[/tex]

Simplifying these gives us the following list of possible rational zeros:

[tex]±1, ±2, ±1/5, ±2/5[/tex]

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Answer:

Step-by-step explanation:

dvbd

Yes, the two points (-2,-3) and (2,-1) belong to the same linear function.

To determine the function, we can use the slope-intercept form of an linear equation, which is y = mx + b, where m is the slope and b is the y-intercept.

First, we need to find the slope of the line using the formula m = (y2 - y1) / (x2 - x1). Plugging in the values of the given points, we get:

m = (-1 - (-3)) / (2 - (-2)) = 2 / 4 = 1/2

Now, we can use one of the given points and the slope to find the y-intercept. Let's use the point (2,-1) and plug in the values into the equation y = mx + b:

-1 = (1/2)(2) + b

Solving for b, we get:

b = -1 - 1 = -2

Therefore, the equation of the linear function is y = (1/2)x - 2.

So, the two points (-2,-3) and (2,-1) belong to the same function, which is y = (1/2)x - 2.

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∫[infinity]0e^(−x^2/a)dx is 1/2√π/a, rounded to five decimal places is 0.38539.

To evaluate the integral ∫[infinity]0e^(−x^2/a)dx, given that ∫[infinity]0e^(−x^2)dx=1/2√π and a = 2.1, we use the substitution u = x^2/a. We then have du = 2x/a dx and the limits of the integral change to 0 to ∞/a. So, the integral becomes:

∫[∞/a]0 e^(-u) du

By the given information, we know that ∫[∞/a]0 e^(-u) du = 1/2√π/a.

Therefore, the answer to the integral ∫[infinity]0e^(−x^2/a)dx is 1/2√π/a, rounded to five decimal places is 0.38539.

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The expression 6 is a polynomial. It is a constant polynomial with a degree of 0.

A polynomial is an expression consisting of variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents. A constant polynomial is a polynomial with no variables, and only consists of a constant term.

In the expression 6, there are no variables and it only consists of a constant term, which makes it a constant polynomial. The degree of a polynomial is the highest exponent of the variable in the polynomial. Since there are no variables in the expression 6, the degree of the polynomial is 0.

Therefore, the expression 6 is a constant polynomial with a degree of 0.

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Answer:

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

Step-by-step explanation:

nothing further can happen.

The value of angle x is 134°.

We have:

Angle ABD = 180° (straight line)

Angle ABE = 44° (given)

Angle BCE = 90° (as BC is perpendicular to AB)

Angle AEC = 180° - Angle BCE - Angle BAE = 180° - 90° - 44° = 46° (angle sum of triangle ABE)

Now, we can use the exterior angle property of triangles to find the value of angle x.

Angle AED = Angle AEC + Angle CED = 46° + x (exterior angle property of triangle CED)

Angle AED = Angle ABD = 180° (opposite angles of a cyclic quadrilateral)

Therefore, we have:

46° + x = 180°

x = 180° - 46°

x = 134°

Hence, the value of angle x is 134°.

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Answer:

The answer would be at 11 30 the temperature would be at 3°C

Answer:

V=103.

Step-by-step explanation:

V=πr2h

=π·2.82

·4.2≈103

.44636

Answer:

Step-by-step explanation:

the correct answer is 10.39 cubic feet

In the triangle ABC, the value of BD is obtained as 34 units.

What are triangles?

Triangles are a particular sort of polygon in geometry that have three sides and three vertices. Three straight sides make up the two-dimensional figure shown here. An example of a 3-sided polygon is a triangle. The total of a triangle's three angles equals 180 degrees. One plane completely encloses the triangle.

A triangle ABC is given.

A line segment DE divides the triangle.

The measure of AD is given as 51 units.

The measure of BE is given as 16 units.

The measure of CE is given as 24 units.

According to the indirect measurement -

AD / BD = CE / BE

Substitute the values in the equation -

51 / BD = 24 / 16

24 BD = 51 × 16

BD = 17 × 2  

BD = 34  

Therefore, the value of BD is obtained as 34 units.

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Answer: 34

Step-by-step explanation:

Answer:

The "fittest" mice to survive in a forest environment would depend on various factors such as the specific characteristics of the forest, availability of resources, and the predators and other species present in the area.

Generally, mice that are well adapted to forest environments would possess certain traits such as:

Good sense of smell: Forest environments are often dense and may provide cover for predators. Mice with a good sense of smell are better equipped to navigate and find food in such environments.

Good vision: Some mice species have adapted to have good vision to better navigate through their environment and avoid predators.

Climbing ability: Mice that are able to climb trees and other obstacles can better avoid predators and find food sources.

Ability to burrow: Some mice may dig burrows to escape predators or find shelter, and those that are well adapted to digging will be better equipped to do so in a forest environment.

Based on these criteria, mice such as the white-footed mouse and the deer mouse are well-suited to forest environments. These species possess a good sense of smell and vision, can climb and burrow when necessary, and are able to find food sources such as nuts, seeds, and insects in the forest. However, there may be other mouse species that are better adapted to a specific forest environment, and the "fittest" mice would ultimately depend on the specific characteristics of the forest in question.

The distances based on their values, we have:

Distances of approximately 1 to 2 units: (-3, 1) and (-4, -2)

Distances of approximately 3 units: (2, 1) and (1, 2)

Distances of approximately 5 units: (3, 7) and (4, -1), (5, -2) and (3, 3), and (-1, 1) and (4, -1).

Coordinates (3, 4) (3, 7) (5, -2) (-2, 3) (-4, -2) (4, -1)

(2, 1)           3.16    

(5, 2)                   5.39    

(3, 3)                             5.1  

(1, 2)                                             3.16  

(-3, 1)                                                1.41

(-1, 1)                                                        5.1

We may use the distance formula to determine the separation between each pair of coordinates:

Distance is equal to sqrt((x2 - x1) + (y2 - y1))

Using the values to categorise the distances, we have:

About 1 to 2 unit distances are (-3, 1) and (-4, -2)

Distances roughly 3 units apart: (2, 1) and (1, 2) Distances roughly 5 units apart: (3, 7) and (4, -1), (5, -2) and (3, 3), and (-1, 1) and (4, -1).

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The solution to the exponential equation [tex]4^-3v-2=4^-v[/tex]is v = -1.

To solve the exponential equation 4^(-3v-2)=4^(-v) using like bases and the one-to-one property,

Identify the like bases on both sides of the equation. In this case, the like base is 4.

Use the one-to-one property of exponential functions, which states that if two exponential functions with the same base are equal, then their exponents must also be equal. So, we can set the exponents equal to each other:

-3v - 2 = -v

Solve for the variable, v. We can do this by isolating the variable on one side of the equation:

-3v + v = 2

-2v = 2

v = -1

Check our answer by plugging it back into the original equation:

4^(-3(-1)-2) = 4^(-(-1))

4^(3-2) = 4^(1)

4^(1) = 4^(1)

4 = 4

So the solution to the exponential equation [tex]4^-3v-2=4^-v[/tex]is v = -1.

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The area of an "A" sector with central angle 2.781 is 36.17 square units. The area of a "B" sector with central angle 1.54519 is 20.10 square units. The area of a "C" sector with central angle 112.128 degree is 49.81 square units. Grade in order of increasing likelihood: B, A, C. Likelihood that you will receive an "A" is 0.4427.

The area of a sector of a circle can be found using the formula A = (1/2)r^2θ, where r is the radius of the circle and θ is the central angle of the sector in radians. To find the area of each sector, we need to convert the central angles from degrees to radians by multiplying by π/180.

The area of an "A" sector with central angle 2.781 radians is A = (1/2)(5.1)^2(2.781) = 36.17 square units.

The area of a "B" sector with central angle 1.54519 radians is A = (1/2)(5.1)^2(1.54519) = 20.10 square units.

The area of a "C" sector with central angle 112.128 degrees is A = (1/2)(5.1)^2(112.128)(π/180) = 49.81 square units.

The total area of the circle is A = πr^2 = π(5.1)^2 = 81.71 square units.

The likelihood of receiving an "A" is the area of the "A" sector divided by the total area of the circle, or 36.17/81.71 = 0.4427.

The likelihood of receiving a "B" is the area of the "B" sector divided by the total area of the circle, or 20.10/81.71 = 0.2460.

The likelihood of receiving a "C" is the area of the "C" sector divided by the total area of the circle, or 49.81/81.71 = 0.6096.

Therefore, the grades in order of increasing likelihood are: B, A, C.

The likelihood that you will receive an "A" is 0.4427.

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Answer:

Step-by-step explanation:

Diameter is the width of the cup and 7 is the height.

Process of elimination rules out A as it is too big.

The base of the cup is a circle.

  Formula for area of a circle is Pi (3.14) times the radius squared.

1. Find radius

Diameter is 2x the radius, so if we have a 4.4 diameter, the radius will be 2.2.

2. Square radius

2.2x2.2=

4.84

3. Times Pi

Multiply 4.84 by 3.14 (Pi) to get

15.1976

15.1976 is the area of the base. Now we multiply that by 7!

15.1976 x 7=

This is our answer, but we need to round it to the nearest hundredth, the question tells us.

106.38 is the final answer.

Answer:

The decimal part of 40 is 0.40. 102 is not a decimal part of 40, so the answer is 0.

To explain further, a decimal part of a number is a fractional part of the number expressed as a decimal. For example, the decimal part of 40 is 0.40, which is the same as 40/100 or 4/10. 102 is not a fractional part of 40, so it cannot be expressed as a decimal part of 40.

After the multiplication of the given decimal numbers and their power, we got the value as 105,000.

One of the number types in algebra that has a whole integer and a fractional portion separated by a decimal point is a decimal. The decimal point is the dot that appears between the parts of a whole number and a fraction. Between integers, decimal numbers are used to express the numerical value of complete and partially whole quantities.

Simply change the decimal place to the right by the number of 0s in the power of 10 when multiplying a decimal by a power of 10. Simply change the decimal place to the left by the number of 0s in the power of 10 when dividing a decimal by a power of 10.

We are asked to solve the question:

      (2.5 X 10⁻²)(4.2 X 10⁶)

Now we have to solve this following the PEDMAS rule.

So we have to solve the parentheses first.

2.5 * 10⁻²

Here the exponent has negative power.

10⁻²  = 1/10² = 1/100

Then,

2.5 * 10⁻²  = 2.5 * 1/100 = 0.0025

This is because when the number is divided by the power of 10, the decimal point moves to the left by the value of the power of 10.

Here the power is 2. So it moved two decimal places to the left.

4.2 * 10⁶

Here the decimal number is multiplied by the power of 10. So the decimal point moves  6 places to the right.

4.2 * 10⁶  = 4200000

Now after solving parentheses, we get

0.0025 * 4200000 = 25 * 10⁻⁴ * 4200000 = 105,000,000 * 10⁻⁴

                                                              = 105,000

Therefore after the multiplication of the given decimal numbers and their power, we got the value as 105,000.

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Karen invested $6000 in Fund B, and $24000 in Fund A, as the weighted average of the two funds' returns is 5%, yielding a total profit of $1380, and we can use a system of equations to solve for the amounts invested in each fund.

To solve this problem, we can set up a system of equations using the information given.

Let x be the amount invested in Fund B, then the amount invested in Fund A is 4x. The total amount invested is the sum of these two amounts, so we have:

The total profit from the two funds is given as $1380, which is the sum of the profits from Fund A and Fund B.

We can express these profits using the amounts invested and the respective return rates:

Solving for x, we find that x = $6000, which is the amount invested in Fund B. Therefore, the amount invested in Fund A is 4x = $24000.

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For the function f(x) = x2 - 2x, the intervals for which f(x) is greater than or equal to zero are x ≥ 0 and x ≤ 2.

We can solve this equation by setting f(x) equal to zero and solving for x:
x2 - 2x = 0
x(x - 2) = 0
x = 0 or x = 2

Therefore, the intervals for which f(x) is greater than or equal to zero are x ≥ 0 and x ≤ 2.

Equations are two mathematical expressions that equal each other, separated by an equals sign ("="). In equations, we can find data that may or may not be known.

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To find the dimensions of a cylinder with a specific volume and height to radius ratio, we can use the formula for the volume of a cylinder, V = πr^2h, where V is the volume, r is the radius, and h is the height. We can also use the given information that the height must be between 4 to 6 times the radius, or 4r ≤ h ≤ 6r.

We can start by plugging in the given volume and the height to radius ratio into the formula:
1.25 L = πr^2(4r)

Dividing both sides by 4π gives us:
r^3 = 1.25 L / (4π)

Taking the cube root of both sides gives us the radius:
r = (1.25 L / (4π))^(1/3)

Now we can use the height to radius ratio to find the height:
h = 4r = 4(1.25 L / (4π))^(1/3)

So the dimensions of the cylinder are:
r = (1.25 L / (4π))^(1/3)
h = 4(1.25 L / (4π))^(1/3)

These dimensions will result in the desired volume of 1.25 L and a height that is between 4 to 6 times the radius.

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We cannot conclude that the type of tag and penguin survival are not independent of one another for this smaller sample size.

a) The expected 2x2 table would look like this:

|            | Metal Tag | Electronic Tag |
|------------|-----------|----------------|
| Survived   | 483.637   | 456.363        |
| Not Survived | 473.363   | 569.637        |

The observed data is not consistent with the assumption of independence, as the observed values are different from the expected values. To carry out a chi-squared test, we need to calculate the chi-squared statistic:

X^2 = (957-483.637)^2/483.637 + (540-456.363)^2/456.363 + (301-473.363)^2/473.363 + (185-569.637)^2/569.637 = 237.525

The degrees of freedom for this test are (2-1)(2-1) = 1. Using a chi-squared distribution table, we can find the p-value for this test. The p-value is less than 0.001, which is very small. This means that the observed data is very unlikely to have occurred by chance if the assumption of independence is true. Therefore, we can reject the null hypothesis that the type of tag and penguin survival are independent of one another.

b) If the null hypothesis specified the probability of survival and the probability of a penguin wearing a metal tag, then the expected values in the 2x2 table would change. The new expected values would be:

|            | Metal Tag | Electronic Tag |
|------------|-----------|----------------|
| Survived   | 609.711   | 330.289        |
| Not Survived | 347.289   | 695.711        |

The chi-squared statistic would also change:

X^2 = (957-609.711)^2/609.711 + (540-330.289)^2/330.289 + (301-347.289)^2/347.289 + (185-695.711)^2/695.711 = 444.787

The p-value for this test would still be less than 0.001, so we would still reject the null hypothesis that the type of tag and penguin survival are independent of one another.

c) With a smaller sample size, the chi-squared test may not be appropriate. The expected values in the 2x2 table would be very small, and the chi-squared statistic may not follow a chi-squared distribution. Instead, we could use a Fisher's exact test to address the question of independence between survival and tag type. The null hypothesis for this test is that the type of tag and penguin survival are independent of one another. The alternative hypothesis is that the type of tag and penguin survival are not independent of one another. The p-value for this test is 0.657, which is not small enough to reject the null hypothesis. Therefore, we cannot conclude that the type of tag and penguin survival are not independent of one another for this smaller sample size.

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