*2 SIMPLE QUESTIONS FOR 20 POINTS!!*

Hello! Please help!!! I am not good at calculating this stuff

Thank you very much!

<3

The man had $1.60 at first.

What is an equation?

An equation is a statement that shows that two expressions are equal. It contains an equals sign "=" and may include variables, constants, coefficients, and mathematical operations such as addition, subtraction, multiplication, and division.

Let's assume the man had x amount of money at first.

Then he spent 1/8x on a package of cigarettes and 3 times as much, or 3/8x, on a meal.

So he spent a total of 1/8x + 3/8x = 1/2x of his money.

If he had 80 cents left, that means he spent x - 0.8.

So we can set up an equation:

1/2x = x - 0.8

Solving for x:

1/2x - x = -0.8

-1/2x = -0.8

x = (-0.8)/(-1/2)

x = 1.6

Therefore, the man had $1.60 at first.

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The exact price of the chair including tax is $425.25. The solution has been obtained by using arithmetic operations.

What are arithmetic operations?

The four fundamental operations, also referred to as "arithmetic operations," are said to be able to explain all real numbers. The four mathematical operations following division, multiplication, addition, and subtraction are quotient, product, sum, and difference.

We are given that the original price of a chair was $450.00 and on it, there was tax of 5.5%.

So, using the arithmetic operations, we get

⇒Exact price = 450 - 5.5% of 450

⇒Exact price = 450 - 24.75

⇒Exact price = $425.25

Hence, the exact price of the chair including tax is $425.25.

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The solution to the system of equations is (3, -7).

To find the solution of these two equations, we need to find the values of x and y that satisfy both equations simultaneously.

We can set the two equations equal to each other to get:

-5x + 8 = x/3 - 8

Multiplying both sides by 3, we get:

-15x + 24 = x - 24

Simplifying, we get:

-16x = -48

Dividing both sides by -16, we get:

x = 3

Now that we know x = 3, we can substitute it into either of the original equations to find y. Let's use the equation y = -5x + 8:

y = -5(3) + 8 = -7

Therefore, the solution to the system of equations is (3, -7).

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The land will cost approximately $52,800.00.

What is triangle ?

A triangle is a polygon with three sides and three angles. It is one of the simplest and most basic shapes in geometry. The three sides of a triangle can be of different lengths, and the three angles can also be of different sizes. The sum of the angles in a triangle is always 180 degrees.

To find the area of the triangular lot, we can use Heron's formula for the area of a triangle:

s = (1360 + 1850 + 2430)/2 = 2820

A = √[s(s-1360)(s-1850)(s-2430)] ≈ 1,046,482.74 square feet

To convert this to acres, we divide by 43,560:

A ≈ 24.00 acres

Finally, we can calculate the cost of the land by multiplying the area in acres by the price per acre:

cost = 24.00 acres × $2200/acre ≈ $52,800.00

Therefore, the land will cost approximately $52,800.00.

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Answer: To calculate the amount of the element remaining after 16 minutes, we can use the formula:

A = P * (1 - r)^t

where:

A = amount remaining after time t

P = initial amount

r = rate of decay per unit time (as a decimal)

t = time elapsed

In this case, we have:

P = 420 grams

r = 0.118 per minute

t = 16 minutes

Substituting these values into the formula, we get:

A = 420 * (1 - 0.118)^16

A ≈ 123.82 grams

Rounding this answer to the nearest tenth of a gram, we get:

A ≈ 123.8 grams

Therefore, approximately 123.8 grams of the element remain after 16 minutes.

Answer:

A = (1/4)πr^2

where r is the radius of the circle.

If the side and base mentioned in the question refer to the radius of the circle, then the area of the quadrant can be calculated as follows:

Given, radius (r) = 8 cm

The area of the quadrant = (1/4)πr^2

= (1/4)π(8)^2

= 16π square cm

= 50.27 square cm

Answer:

64 %

Step-by-step explanation:

To change a fraction to a percent, we need the denominator as 100.

16        4

----  * -----

25       4

64

-----

100

Percent means out of 100, so the percent is 64 %

Bi-weekly gross paycheck based on 40 hours a week at a rate of $18.25 per hour is $1,460.

What is multiplication ?

Multiplication is a basic arithmetic operation that involves combining two or more numbers to find their product or the total number of items when a certain number is repeated a certain number of times. In multiplication, the numbers being combined are called factors, and the result is called the product.

To calculate your bi-weekly gross paycheck, you need to multiply your hourly rate by the number of hours you work per week and then multiply that by 2 to account for two weeks in a pay period.

Hourly rate: $18.25

Weekly hours: 40

Bi-weekly hours: 40 x 2 = 80

Bi-weekly gross paycheck: Hourly rate x Bi-weekly hours

Bi-weekly gross paycheck: $18.25 x 80 = $1,460

Therefore, your bi-weekly gross paycheck based on 40 hours a week at a rate of $18.25 per hour is $1,460.

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Part A: −Δ[[tex]H2O2[/tex]]/Δt = Δ[[tex]H2[/tex]]/Δt + Δ[[tex]O2[/tex]]/Δt

Part B: −Δ[[tex]H2O2[/tex]]/Δt = Δ[[tex]O2[/tex]]/Δt

Part C: −Δ[[tex]N2O[/tex]]/Δt = 1/2 Δ[[tex]N2[/tex]]/Δt + Δ[[tex]O2[/tex]]/Δt

Part D: −Δ[[tex]N2O[/tex]]/Δt = Δ[[tex]O2[/tex]]/Δt

Part E: −Δ[[tex]N2[/tex]]/Δt = 1/2 Δ[[tex]NH3[/tex]]/Δt

Part F: −Δ[[tex]H2[/tex]]/Δt = Δ[[tex]NH3[/tex]]/Δt

Part G: −Δ[[tex]C2H5NH2[/tex]]/Δt = Δ[[tex]C2H4[/tex]]/Δt + Δ[[tex]NH3[/tex]]/Δt

Part H: −Δ[tex][C2H5NH2][/tex]/Δt = Δ[tex][NH3][/tex]/Δt

The rate of disappearance of [tex]H2O2[/tex]is equal to the sum of the rates of appearance of H2 and O2.

Part B: −Δ[[tex]H2O2[/tex]]/Δt = Δ[[tex]O2[/tex]]/Δt

The rate of disappearance of [tex]H2O2[/tex] is equal to the rate of appearance of O2.

Part C: −Δ[[tex]N2O[/tex]]/Δt = 1/2 Δ[[tex]N2[/tex]]/Δt + Δ[[tex]O2[/tex]]/Δt

The rate of disappearance of N2O is equal to half the rate of appearance of N2 plus the rate of appearance of O2.

Part D: −Δ[[tex]N2O[/tex]]/Δt = Δ[[tex]O2[/tex]]/Δt

The rate of disappearance of [tex]N2O[/tex]  is equal to the rate of appearance of O2.

Part E: −Δ[[tex]N2[/tex]]/Δt = 1/2 Δ[[tex]NH3[/tex]]/Δt

The rate of disappearance of N2 is equal to half the rate of appearance of[tex]NH3.[/tex]

Part F: −Δ[[tex]H2[/tex]]/Δt = Δ[[tex]NH3[/tex]]/Δt

The rate of disappearance of H2 is equal to the rate of appearance of NH3.

Part G: −Δ[[tex]C2H5NH2[/tex]]/Δt = Δ[[tex]C2H4[/tex]]/Δt + Δ[[tex]NH3[/tex]]/Δt

The rate of disappearance of[tex]C2H5NH2[/tex] is equal to the sum of the rates of appearance of[tex]C2H4[/tex] and [tex]NH3.[/tex]

Part H: −Δ[tex][C2H5NH2][/tex]/Δt = Δ[tex][NH3][/tex]/Δt

The rate of disappearance of [tex]C2H5NH2[/tex] is equal to the rate of appearance of [tex]NH3.[/tex]

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The total cost of the mirror based on its area is obtained as $9.80.

What is area?

An object's area is how much space it takes up in two dimensions. It is the measurement of the quantity of unit squares that completely cover the surface of a closed figure.

The area of the bathroom mirror can be found by multiplying its length and width -

Area = Length × Width

Area = 5 feet × 4 feet

Area = 20 square feet

Since the mirror sells for $0.49 per square foot, we can find the total cost of the mirror by multiplying the area of the mirror by the cost per square foot -

Total Cost = Area × Cost per square foot

Total Cost = 20 square feet × $0.49 per square foot

Total Cost = $9.80

Therefore, the total cost of the bathroom mirror will be $9.80.

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Answer:

A. 450 trucks

Step-by-step explanation:

Given

Answer
A. 450 trucks

Answer:

≈ 50 cm²

Step-by-step explanation:

Use the equation [tex]A= \frac{1}{4} \pi d^{2}[/tex] Where d is the diameter.

Answer:

The answer that you're looking for is approximately 50 (rounded), In terms of π, it is 16π.

Step-by-step explanation:

In order to find the area you need to use the formula: Area = [tex]\pi r^{2}[/tex].

Since The Diameter is double the amount of the radius you need to make sure to divide the diameter by 2 and replace "r" in the equation with the equation given.

8/2 gives you 4.  Now you have the equation Area of Circle =  [tex]\pi 4^{2}[/tex].

Following the rules of PEMDAS we do exponents since there is no parenthesis.

[tex]4^{2}[/tex] is the same as 16. In terms of pi, you just put pi next to your result giving 16π.

However, if you want to find out normally you can multiply with either 3.14 or π.

Both cases will give you different decimals, but when rounded to the nearest whole number they all give you 50.

Area of Circle  = [tex]\pi r^{2}[/tex].
Area of Circle  = [tex]\pi 4^{2}[/tex]
Area of Circle  = 16π
Area of Circle = 50 (rounded).

I hope this was helpful!

The simplified expression, expressed in expanded form, is (3m - y)/(12m + 2y).

To simplify the expression (6m² - 5my - y²)/(12m + 2y), we can factor the numerator and denominator, if possible, and then simplify the expression by canceling out common factors.

The numerator can be factored as follows:

6m² - 5my - y² = (3m - y)(2m + y)

The denominator can also be factored by factoring out a common factor of 2:

12m + 2y = 2(6m + y)

Now we can substitute these factorizations back into the original expression:

(6m² - 5my - y²)/(12m + 2y) = [(3m - y)(2m + y)]/[2(6m + y)]

We can now cancel out the common factor of (2m + y) in the numerator and denominator:

[(3m - y)(2m + y)]/[2(6m + y)] = (3m - y)/(2(6m + y))

Expanding this expression, we get:

(3m - y)/(2(6m + y)) = (3m - y)/(12m + 2y)

Therefore, the simplified expression, in expanded form, can be written as (3m - y)/(12m + 2y).

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A 95% confidence interval for the population mean reduction in cholesterol level is (19.78, 28.22) mg/dl, based on a sample mean of 24 mg/dl and a standard deviation of 15 mg/dl.

Using the information, we can compute a confidence interval  for the population mean decrease in cholesterol level as follows:

1. Calculate the standard error of the mean:

standard error = standard deviation/sqrt(sample size)

= 15/sqrt(50)

= 2.12

2. Calculate the margin of error using a t-distribution with (n-1) degrees of freedom at 95% confidence level:

margin of error = t_(n-1, 0.025) * standard error

= t_(49, 0.025) * 2.12 (using a t-table)

= 2.009 * 2.12

= 4.26

3. Calculate the confidence interval by subtracting and adding the margin of error to the sample mean:

CI = sample mean +/ - margin of error

= 24 +/ - 4.26

= (19.74, 28.26)

In this manner, we can say with 95% certainty that the true mean reduction in cholesterol level following one month of drug of the new medication is between 19.74 mg/dl and 28.26 mg/dl. Since the lower limit reaches the confidence interval (19.74 mg/dl) is greater than 20 mg/dl, we can reason that there is persuading proof that the new medication is powerful in lessening cholesterol level following one month of purpose.

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Answer:

72.25π cm²

Step-by-step explanation:

C = 2πr

17π cm = 2πr

Divide both sides by 2π.

8.5 cm = r

r = 8.5 cm

A = πr²

A = π × (8.5 cm)²

A = 72.25π cm²

Answer:

d = [tex]\frac{2}{5}[/tex]

Step-by-step explanation:

[tex]\frac{3}{2}[/tex] = 5d - [tex]\frac{1}{2}[/tex]

multiply through by 2 to clear the fractions

3 = 10d - 1 ( add 1 to both sides )

4 = 10d ( divide both sides by 10 )

[tex]\frac{4}{10}[/tex] = d , then

d = [tex]\frac{2}{5}[/tex]

Answer:

graph A is the correct graph.

The graph of the function is plotted by graph A

Graphs behave differently at various x-intercepts. Sometimes the graph will cross over the x-axis at an intercept. Other times the graph will touch the x-axis and bounce off.

Identify the even and odd multiplicities of the polynomial functions' zeros.

Using end behavior, turning points, intercepts, and the Intermediate Value Theorem, plot the graph of a polynomial function.

The graphs cross or are tangent to the x-axis at these x-values for zeros with even multiplicities. The graphs cross or intersect the x-axis at these x-values for zeros with odd multiplicities

Given data ,

Let the function be represented as f ( x )

Now , the value of f ( x ) is

f ( x ) = ( x - 2 ) ( x + 5 )

To find the x-intercepts (or zeros) of the function f(x) = (x - 2)(x + 5), we need to set the function equal to zero and solve for x.

f ( x ) = ( x - 2 ) ( x + 5 ) = 0

This product is zero if and only if one of the factors is zero. So we can set each factor equal to zero and solve for x.

x - 2 = 0 or x + 5 = 0

x = 2 or x = -5

Hence , the x-intercepts of the function are x = 2 and x = -5 and the graph is plotted

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The table of values for the function y=4-7x can be found by choosing any real value of x and we will get real value output from the function. So  the table C is found to be correct for the function f(x)=4-7x.

For example, let's choose some values of x and calculate the corresponding values of y:

When x = 0, y = 4 - 7(0) = 4

When x = 1, y = 4 - 7(1) = -3

When x = 2, y = 4 - 7(2) = -10

When x = 3, y = 4 - 7(3) = -17

We can continue this process to find more values of y for different values of x.

The resulting table of values is:

x y

0 4

1 -3

2 -10

3 -17

So, this is the table of values defined by the function y=4-7x.

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The complete question is :

Which table of values is defined by the function y=4-7x

Table A                  Table B                       Table C                            Table D

x          y                 x          y                       x          y                           x          y

0         4                 0          0                      0          4                          0         -4

1          3                  1          1                        1          -3                         1          -3          

2          10               2          2                       2        -10                        2         -10

3         17                 3          3                       3        -17                        3         -17

According to the image, we can see that 3 rectangles are half-shaded= 1.5 units²,

A square is a quadrilateral with four equal sides and four equal angles that is a regular quadrilateral. The square's angles are at a straight angle or 90 degrees. The square's diagonals are also equal and split at a 90-degree angle.

A rectangle with two opposite sides that have the same length can also be referred to as a square.

P.S: Rectangle attached in image.

According to the image, we can see that 3 rectangles are half-shaded.

This means that:

Half-shaded square + Half-shaded square + Half-shaded square

=> 0.5 + 0.5 + 0.5

=> 1.5 units²

Check:

To check our answer:

3 x 0.5 = Area of rectangle

=> 1.5 units² = Area of rectangle

Hence, our explanation is correct.

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Answer:

information provided:

ordinary annuity = $650

Number of periods (n) = 20 years

Interest rate (r)= 11 percent

Answer:

10(15h-125)

Step-by-step explanation:

In this question, h is represented for hours. we want to see how much money sally will have after 10 weeks. We know each hour she makes $15 per h. This will look like 15h. We also know her bills cost $125 each week so we have to subtract 125 from 15h which the equation will now look like

15h-125.

Now we want to know how much she will have after 10 weeks so we will now the equation will look like 10(15h-125).

Answer: Pls I don't know this

Step-by-step explanation:

Pls I don't mean to hurt your feelings but my brother knows this and I have sent it to him

The estimated total percentage of the company that exercised at least 3 times a week is approximately 20.5%.

Using the Hansen-Hurwitz dropout plan (method), the estimated total percentage of the company that exercised at least 3 times a week is approximately 20.5%. This can be calculated by multiplying the response rate of the survey (4860/6480) by the response rate of the sample (7/80).

The response rate of the survey is 0.7479 and the response rate of the sample is 0.0875. To get the estimated total percentage of the company that exercised at least 3 times a week, you would multiply these two numbers together to get 0.205 (0.7479 x 0.0875 = 0.205).

So, the percentage is 20.5%.

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Answer:

-------------------------

Use the distance formula to find the distance between two points.

Substitute coordinates and find the length of AB:

Question :-

Answer :-

[tex] \rule{200pt}{3pt}[/tex]

Solution :-

As per the provided information in the given question, we have been given that :-

To calculate the distance between the two points, we will apply the formula below :-

[tex] \bigstar \: \: \: \boxed{ \sf{ \: \: AB = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \: \: }}[/tex]

Substitute the given values into the above formula and solve for AB :-

[tex]\sf:\implies{ AB = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}}[/tex]

[tex]\sf:\implies{AB = \sqrt{( - 4 - 2)^2 + (0 - 4)^2}}[/tex]

[tex]\sf:\implies{AB = \sqrt{(-6)^2 + (-4)^2}}[/tex]

[tex]\sf:\implies{AB = \sqrt{36 + 16}}[/tex]

[tex]\sf:\implies\bold{AB = \sqrt{52} \approx 7.21 \: units}[/tex]

Therefore :-

[tex]\\[/tex]

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Have a great day! <33

Answer: 364 cm^3

Step-by-step explanation: Please mark brainliest and give thanks!

Answer:

[tex]364cm^3[/tex]

Hope this helps!

Brainliest and a like is much appreciated!

The cosine of θ is the ratio of the length of the adjacent side to the length of the hypotenuse

The cosine of an angle is a trigonometric function that relates the length of the adjacent side of a right triangle to the length of the hypotenuse. Specifically, it is defined as the ratio of the length of the adjacent side to the length of the hypotenuse.

In mathematical terms, if we have a right triangle where one of the angles is labeled as theta (θ), then the cosine of theta is given by the formula:

cos(θ) = adjacent side / hypotenuse

1) Cos R =30/34 =15/17

Cos S = 16/34 = 8/17

2) Cos R = 24/26 = 12/13

Cos S = 10/26 = 5/13

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Answer:

(-8/3, 19/27) and (3, -17/2).

Step-by-step explanation:

To find the coordinates of the points on the graph of ƒ(x) = ½x³ − ¹⁄₂x² − 8x + 7 where the gradient is 4, we need to find the points where the derivative of ƒ(x) is equal to 4.

First, we need to find the derivative of ƒ(x):

ƒ'(x) = 3/2x² - x - 8

Next, we need to set ƒ'(x) = 4 and solve for x:

3/2x² - x - 8 = 4

3/2x² - x - 12 = 0

Multiplying both sides by 2 to eliminate the fraction:

3x² - 2x - 24 = 0

Factoring the quadratic equation:

(3x + 8)(x - 3) = 0

So x = -8/3 or x = 3.

Now we can find the corresponding y-coordinates:

When x = -8/3:

ƒ(-8/3) = 1/2(-8/3)³ - 1/2(-8/3)² - 8(-8/3) + 7 = 19/27

So one point on the graph with gradient 4 is (-8/3, 19/27).

When x = 3:

ƒ(3) = 1/2(3)³ - 1/2(3)² - 8(3) + 7 = -17/2

So another point on the graph with gradient 4 is (3, -17/2).

Therefore, the coordinates of the points on the graph of ƒ(x) = ½x³ − ¹⁄₂x² − 8x + 7 where the gradient is 4 are (-8/3, 19/27) and (3, -17/2).

Answer:

s is not inversely proportional to t

Step-by-step explanation:

s is not inversely proportional to t.  I had responded that they were, based on the fact that as s went up, t went down.  But the question was not simply is there an inverse relationship, but are they inversely proportional.

The term proportional means that the relationship between s and t is a constant.  That is:

                                        t = s*(1/x)

Let's rewrite that to y*x = k and then check the numbers.  See the attached spreadsheet.  If the relationship were inversel proportioanl, thaen the product of t*s would be a contant for the series.  The third set is different from the first two.  The data has an is inverse relationship, but it is NOT proportional.

After calculating we get, x-intercept is (-8/3, 0), y-intercept is (0, -16), slope is -6, f(3) = (-34) and So when f(x) = 110, x = -21.

To find the characteristics of the linear function 30x + 5y = -80:

To find the x-intercept, we set y = 0 and solve for x:

30x + 5(0) = -80

30x = -80x = -8/3

So the x-intercept is (-8/3, 0).

To find the y-intercept, we set x = 0 and solve for y:

30(0) + 5y = -80

5y = -80y = -16

So the y-intercept is (0, -16).

To find the slope, we solve for y in terms of x by rearranging the equation to slope-intercept form, y = mx + b:

30x + 5y = -80

5y = -30x - 80y = -6x - 16

So the slope is -6.

To find f(3), we substitute x = 3 into the equation and solve for y:

30(3) + 5y = -80

90 + 5y = -80

5y = -170y = -34

So f(3) = (-34).

To find x when f(x) = 110, we substitute y = 110 into the equation and solve for x:

30x + 5(110) = -80

30x + 550 = -80

30x = -6

30x = -21

So when f(x) = 110, x = -21.

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The surface area of the cylinder in terms of π is 15.98π in².

What is surface area ?

Surface area is the measure of the total area that the surface of a three-dimensional object covers. In other words, it is the sum of the areas of all the faces or surfaces of the object. For example, the surface area of a rectangular prism is the sum of the areas of its six rectangular faces.

To find the surface area of the cylinder, we need to find the area of each of its faces and add them up.

The cylinder has two circular faces, each with a diameter of 3.4 inches. The formula for the area of a circle is A = πr², where r is the radius of the circle. The radius of each circle is half of the diameter, so r = 1.7 inches. Therefore, the area of one circular face is:

A1 = π(1.7 in)² = 9.05π in²

Since there are two circular faces, their total area is:

A1_total = 2 × A1 = 18.1π in²

The cylinder also has a rectangular face, which is the curved surface between the two circular faces. The height of this rectangle is given as 3 inches. The length of this rectangle is the same as the circumference of one of the circular faces, which is πd (where d is the diameter). Therefore, the length of the rectangle is:

L = πd = π(3.4 in) = 10.64 in

The area of the rectangular face is:

A2 = L × h = 10.64 in × 3 in = 31.92 in²

Therefore, the total surface area of the cylinder is:

A_total = A1_total + A2 = 18.1π in² + 31.92 in² = 49.02π in²

Rounding to two decimal places, we get:

A_total ≈ 15.98π in²

So the answer is: 15.98π in².

Therefore, the surface area of the cylinder in terms of π is 15.98π in².

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Answer: 15.98π in²

Step-by-step explanation:

did test and it is right

The safe distance between the supports to carry the load of 1500 pounds is found to be 8 meters.

One kind of proportionality relationship is inverse proportion. If two quantities remain inversely related, one will increase while the other will decrease.

The area of a circle is proportional to its radius, which serves as an illustration of direct proportion.

The equation for inverse proportion of the weight carried along with distance is:

P = 5400 /D

P is load in pounds (lb)

D is the safe distance.

Then, distance to carry 1500 lb of load is:

1500 lb = 1500*0.45 kg

1500 lb = 675 kg

675  = 5400 /D

D = 5400/675

D = 8 meters

Thus, safe distance between the supports to carry the safe load of 1500 pounds is found to be 8 meters.

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