Painters painted half of a wall yellow, their boss told them it was supposed to be painted red, they waited for it to dry and then started covering the yellow with red. At the end of the day, 5/6 of the yellow was painted red, how much of the whole wall had been painted red. ​

Answer:

a

Step-by-step explanation:

Answer:

100 minutes

Step-by-step explanation:

we take 6/km an hour and make it 1 km per 10 minutes and then multiply it by 100

As per the volume, the height of the fish tank is 0.4 inches.

First, we are given that the width of the tank is w inches, the length is w+8 inches, and the height is 18-w inches. We also know that all dimensions are greater than 6 inches. Using the formula for the volume of a rectangular prism, we can write:

V = lwh

Substituting the given values, we get:

1440 = (w+8)(w)(18-w)

Now, we can simplify this equation by expanding the product on the right-hand side:

1440 = 18w² + 8w(18-w)

Simplifying further, we get:

1440 = 18w² + 144w - 8w²

Combining like terms, we get:

10w² + 144w - 1440 = 0

Dividing both sides by 10, we get:

w² + 14.4w - 144 = 0

Now we can solve for w using the quadratic formula:

w = (-b ± √(b² - 4ac)) / 2a

where a = 1, b = 14.4, and c = -144. Plugging in these values, we get:

w = (-14.4 ± √(14.4² - 4(1)(-144))) / 2(1)

Simplifying, we get:

w = (-14.4 ± √(432.16)) / 2

w = (-14.4 ± 20.8) / 2

w = -17.6 or w = 3.6

Since we know that all dimensions are greater than 6 inches, we can eliminate the negative solution and conclude that w = 3.6 inches is not valid. Therefore, the width of the tank is w = 17.6 inches.

Now we can use this value to find the height of the tank. Substituting w = 17.6 into the expression for the height, we get:

h = 18 - w

h = 18 - 17.6

h = 0.4

Therefore, the height of the tank is h = 0.4 inches, or equivalently, 4/10 of an inch.

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The factored form of 3x^2 + 13x - 10 is (3x - 2)(x + 5).

To factor 3x^2 + 13x – 10 by grouping, we need to find two numbers whose product is 3(-10) = -30 and whose sum is 13.

Let's list all the factor pairs of -30:

-1, 30

-2, 15

-3, 10

-5, 6

Out of these pairs, the pair that adds up to 13 is -2 and 15.

We can use these numbers to rewrite the middle term:

3x^2 - 2x + 15x - 10

Now, we can group the first two terms and the last two terms:

(3x^2 - 2x) + (15x - 10)

We can factor out the greatest common factor from each group:

x(3x - 2) + 5(3x - 2)

Now, we can see that we have a common factor of (3x - 2):

(3x - 2)(x + 5)

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The given question is incomplete, the complete question is:

What is the factored form of 3x^2 + 13x - 10?

After answering the presented question, we can conclude that As a equation result, approximately 44.4% of the original trees are still living after three years.

An equation is a mathematical statement that proves the equality of two expressions connected by the equal symbol '='. 2x - 5 Equals 13, for example. Expressions include 2x-5 and 13. The character '=' joins the two expressions. A mathematical formula with two algebraic expressions on either side of an equal sign (=) is known as an equation. It demonstrates the relationship of equivalence between the left and right formulas. In every formula, LHS = RHS (left side = right side).

Assuming that all of the trees on the farm are cut down each year, the percentage of trees that survive after three years is as follows:

60% of the trees die after the first year, leaving only 40% of the original trees.

Following the first year, 40% of the original trees are still standing.

Following the second year, 40% of the original trees remain + (40% of the original trees * 100% - 60% = 40% stump growth) = 64% of the original trees remain.

Following the third year, 40% of the original trees remain + (64% of the original trees * 100% - 60% = 4.4% stump growth) = 44.4% of the original trees remain.

As a result, approximately 44.4% of the original trees are still living after three years.

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Answer:

The formula for compound interest is:

A = P(1 + r/n)^(nt)

Where:

A = the final amount

P = the principal (initial amount)

r = the annual interest rate (as a decimal)

n = the number of times the interest is compounded per year

t = the time the money is invested (in years)

In this case, P = $500, r = 0.12, n = 2 (compounded twice a year), and t = 2.

So, A = 500(1 + 0.12/2)^(2*2) = $673.01

Therefore, Sam's total investment will be worth $673.01 after 2 years.

Step-by-step explanation:

The equation of the given circle is: (x - 5)² + (y+ 1)² = 256

The center-radius form (most formally called the standard form) of a circle is usually expressed as;

(x - h)² + (y - k)² = r²

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

We are given a circle with center T(5,-1) and a radius of 16 units

The equation then becomes:

(x - 5)² + (y - (-1))² = 16²

(x - 5)² + (y+ 1)² = 256

Thus, we can conclude that is the equation of the circle.

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Answer:45%

Step-by-step explanation:

:))))

Answer:

45%

Step-by-step explanation:

99/180 = 55%

100% - 55% = 45% decrease

Answer: 45%

Answer:

[tex]x = -2[/tex]

Step-by-step explanation:

[tex] \frac{(x + 8)}{[(x + 3) (x + 4)]} = \frac{3}{(x + 3)}[/tex]

Multiplying both sides by (x + 3) (x + 4), we get:

[tex](x + 8) = 3 (x + 4)[/tex]

Expanding the right-hand side, we get:

[tex]x + 8 = 3x + 12[/tex]

Subtracting x and 8 from both sides, we get:

[tex]2x = -4[/tex]

Dividing both sides by 2, we get:

[tex]x = -2[/tex]

Therefore, the solution to the given equation is x = -2. We can check this solution by substituting x = -2 into the original equation and verifying that both sides are equal.

Around 62.47% of the data population is situated between a z-score of -1.5 and 0.5.

Assuming a standard normal distribution, the percentage of the data population that falls between a z-score of -1.5 and 0.5 can be calculated using a standard normal table or a calculator.

Using a standard normal table, we can find the area under the curve between z = -1.5 and z = 0.5.

The area to the left of z = 0.5 is 0.6915, and the area to the left of z = -1.5 is 0.0668. Therefore, the area between z = -1.5 and z = 0.5 is:

0.6915 - 0.0668 = 0.6247

So, approximately 62.47% of the data population falls between a z-score of -1.5 and 0.5.

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The quotient of [tex]40y^(4)-5y^(3)-30y^(2)-10y[/tex] divided by [tex]8y^(3) - y^(2) - 6y - 2[/tex]

You can use the polynomial long division method to find the product of two polynomials. Following are the steps:

To divide [tex]40y^(4)-5y^(3)-30y^(2)-10y[/tex] by 5y, we utilize long division.  Divide dividend by divisor to obtain first term of the quotient:

[tex]40y^(4) / (5y) = 8y^(3)[/tex]

Multiply divisor (5y) by first term of quotient (8y^(3)) to obtain first term of partial product:

[tex](8y^(3))(5y) = 40y^(4)[/tex]

Subtract the partial product from the dividend to obtain remainder:

[tex]40y^(4) - 40y^(4) = 0[/tex]

[tex]-5y^(3) / (5y) = -y^(2)(-y^(2))(5y) = -5y^(3)-5y^(3) - (-5y^(3)) = 0[/tex]

[tex]-30y^(2) / (5y) = -6y(-6y)(5y) = -30y^(2)-30y^(2) - (-30y^(2)) = 0[/tex]

Repeat process:

[tex]-10y / (5y) = -2(-2)(5y) = -10y-10y - (-10y) = 0[/tex]

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The angle between the line of sight from the lighthouse to the tugboat is 27° and the angle between the line of sight from the lighthouse to the cargo ship is 54°.

Let's call the angle between the line of sight from the lighthouse to the tugboat "x". Then, we know that the angle between the line of sight from the lighthouse to the cargo ship is x+27, since the given angle between the lines of sight is 27°.

We also know that the angle between the lines of sight at the cargo ship is twice the angle between the lines of sight at the tugboat. Using this information, we can set up the equation:

2x = x+27

Solving for x, we get:

x = 27

So the angle between the line of sight from the lighthouse to the tugboat is 27°. Then, we can use this to find the angle between the line of sight from the lighthouse to the cargo ship:

x+27 = 27+27 = 54

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Answer: 5/6

Step-by-step explanation:

First, you find the common denominator of the two:

3/6 + 2/6

Now you can easily add the two:

5/6

Answer:

See below.

Step-by-step explanation:

We are asked to Add Fractions.

Fractions are parts of a single whole number.

To make adding these fractions similar, we should have a common denominator.

[tex]\frac{Numerator}{Denominator}[/tex]

When we add common denominators, they remain the same. This makes adding fractions much easier.

Let's identify the common denominator by finding the Least Common Multiple. (LCM)

The LCM is the smallest common multiple that 2 numbers have. A multiple is the product of that number.

An Example of Multiples:

[tex]4; 4 \times 1, 4 \times 2, 4 \times 3, 4 \times 4, 4 \times 5, 4 \times 6.\\4; 4, 8, 12, 16, 20, 24.[/tex]

An Example of the LCM:

[tex]4; 4, 8, 12, 16, 20, [24], 28\\6; 6, 12, 18, [24], 30, 36, 42. \\The \ LCM \ is \ 24.[/tex]

Let's use the example above as a guide, but for our values in the denominator.

[tex]2; 2, 4, [6], 8, 10, 12, 14.\\3; 3, [6], 9, 12, 15, 18, 21.\\The \ LCM \ is \ 6.[/tex]

Our Denominators will be 6.

Multiply both the Numerator and the Denominator by the number needed to make the denominator 6.

[tex]\frac{1 \times 3}{2 \times 3}=\frac{3}{6} \\\frac{1 \times 2}{3 \times 2} = \frac{2}{6}[/tex]

Add:

[tex]\frac{3}{6} + \frac{2}{6} = \frac{5}{6} \\[/tex]

Our final answer is [tex]\frac{5}{6} .[/tex]

the approximate volume of the tissue box to the nearest whole number is 300 cubic centimeters.

The volume of a rectangular prism is given by the formula V = lwh, where l, w, and h are the length, width, and height of the prism, respectively.

Substituting the given values, we get:

V = (5.2 cm)(9.6 cm)(6 cm)

Simplifying, we get:

V = 299.52 cubic centimeters

Therefore, the approximate volume of the tissue box is 299.52 cubic centimeters.

Since the dimensions of the tissue box are given to only two decimal places, we can reasonably assume that the answer accurate to two decimal places is a good approximation. If we want to express the answer to the nearest whole number, we would round it to the nearest integer.

Rounding 299.52 to the nearest integer, we get:

V ≈ 300 cubic centimeters

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The value of x which would make GHJK a rhombus would be 42 degrees.

Nora can construct a kite with diagonals that bisect each other if the kite is in the shape of a rhombus.

The way that a Rhombus is drawn is such that ∠ GKJ and ∠ HGK would add up to 180 degrees. If these angles are bisected as shown, then the corresponding angles would add up to 90 degrees as a result.

If this shape is to be a rhombus then the value of x would be :

= 90 - 48

= 42 degrees

A kite is a quadrilateral with two pairs of adjacent congruent sides. The diagonals of a kite intersect at a right angle, but they do not necessarily bisect each other.

If the diagonals of a kite bisect each other, it means that they cut each other into two equal parts. This can only happen if the kite is a rhombus, which is a special type of kite where all four sides are congruent.

Therefore, if Nora wants to construct a kite with diagonals that bisect each other, she would need to ensure that the kite is a rhombus.

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A table that represents a linear function include the following: A.

x −4 −2 0 2 4

y   5 1 −3 −7 −11

In Mathematics, a linear function can be defined as a type of function whose equation is graphically represented by a straight line on the cartesian coordinate.

This ultimately implies that, a linear function has the same (constant) slope and it is typically used for uniquely mapping an input variable to an output variable, which both increases simultaneously.

Next, we would determine the slope by using the points contained in the table as follows;

Slope (m) = (Change in y-axis, Δy)/(Change in x-axis, Δx)

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Slope (m) = (1 - 5)/(-2 + 4) = (-3 - 1)/(0 + 2) = (-7 + 3)/(2 - 0)

Slope (m) = -2.

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The lengths of the sides of the special 30°–60° right triangles are;

14. a = 8

b = 8·√3

c = 16

15. a = 4

b = 4·√3

c = 8

16. a = 7

b = 7·√3

c = 14

17. a = 12

b = 12·√3

c = 24

18. a = 5

b = 5·√3

c = 10

19. a = 9

b = 9·√3

c = 18

20. a = 10

b = 10·√3

c = 20

21. a = (√6)/2

b = 3·(√(2))/s

c = √6

Special right triangles are triangles that have 30°, 60°, and 45° interior angles.

The unknown lengths of the 30-60 special right triangle can be found as follows;

14. The length of the side a = 8

The length of the hypotenuse side, c can be found as follows;

sin(30°) = 1/2

sin(θ) = a/c

sin(30°) = 1/2 = 8/c

c = 2 × 8 = 16

c = 16

cos(θ) = b/c

cos(30°) = √3/2

Therefore; √3/2 = b/16

b = 16 × (√3/2) = 8·√3

b = 8·√3

15. a = 4, therefore;

c = 2 × 4 = 8

c = 8

b = (√3/2) × 8 = 4·√3

b = 4·√3

16. a = 7

b = 7·√3

c = 2 × 7 = 14

c = 14

17. a = b/√3, therefore;

a = 12·√3/√3 = 12

a = 12

b = 12·√3

c = 2 × a, therefore;

c = 2 × 12 = 24

c = 24

18. a = 5

b = a × √3, therefore;

b = 5 × √3 = 5·√3

b = 5·√3

c = 2 × a, therefore;

c = 2 × 5 = 10

c = 10

19. c = 18

a = c/2, therefore;

a = 18/2 = 9

a = 9

b = a × √3, therefore;

b = 9 × √3 = 9·√3

b = 9·√3

20. a = 10

b = a × √3, therefore;

b = 10 × √3 = 10·√3

b = 10·√3

c = 2 × a, therefore;

c = 2 × 10 = 20

c = 20

21. c = √6

a = c/2, therefore;

a = (√6 )/2

b = a × √3, therefore;

b = ((√6)/2) × √3 = (√(18))/2 = 3·√2/2

b = 3·√2/2

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[tex]\textit{area of a circular ring}\\\\ A=\pi (R^2 - r^2) ~~ \begin{cases} R=\stackrel{outer}{radius}\\ r=\stackrel{inner}{radius}\\[-0.5em] \hrulefill\\ R=4\\ r=2 \end{cases}\implies A=\pi (4^2 - 2^2) \\\\\\ A=12\pi \implies A\approx 37.70~in^2[/tex]

Answer:

12πin² = 37.7in² (3sf)

Step-by-step explanation:

area of whole circle = π(4)² = 16π

area of small circle = π(2)² = 4π

area of shaded = 16π - 4π = 12π

12π = 37.6991... ≈ 37.7in² (3sf)

The equation of the tangent line to the given path at the specified value of t is (x - sin(3), 3cos(3)(y - cos(3)), -3sin(3)(z - 1), 9/2).

To determine the equation of the tangent line to the given path at the specified value of t, we need to find the derivative of the given path with respect to t. The derivative of the given path is (3cos(3t), -3sin(3t), 9t^8/2). Now, we can plug in the specified value of t = 1 to find the slope of the tangent line at that point. The slope of the tangent line at t = 1 is (3cos(3), -3sin(3), 9/2).

Next, we can find the point on the given path at t = 1 by plugging in the specified value of t into the original equation. The point on the given path at t = 1 is (sin(3), cos(3), 1).

Finally, we can use the point-slope form of an equation to find the equation of the tangent line. The equation of the tangent line in (x, y, z) coordinates is (x - sin(3)) = 3cos(3)(y - cos(3)) = -3sin(3)(z - 1) = 9/2.

Therefore, the equation of the tangent line to the given path at the specified value of t is (x - sin(3), 3cos(3)(y - cos(3)), -3sin(3)(z - 1), 9/2).

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The volume generated by rotating the region in the first quadrant bounded by y = ex and the x-axis from x = 0 to x = ln(3) about the y-axis is (πln(3)3)/3.

To find the volume generated by rotating the region in the first quadrant bounded by y = ex and the x-axis from x = 0 to x = ln(3) about the y-axis, we can use the disk method. The disk method involves slicing the region into thin disks and adding up their volumes.

The volume of each disk is πr2h, where r is the radius of the disk and h is the thickness of the disk. In this case, the radius of each disk is x and the thickness is dx.

So, the volume of the region is:

V = ∫0ln(3)πx2dx

We can use the power rule for integration to solve this integral:

V = π∫0ln(3)x2dx = π[(x3)/3]0ln(3) = π[(ln(3)3)/3 - (03)/3] = (πln(3)3)/3

Therefore, the volume generated by rotating the region in the first quadrant bounded by y = ex and the x-axis from x = 0 to x = ln(3) about the y-axis is (πln(3)3)/3. This is the exact form of the volume.

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A coffee pot that holds 2 quarts is equal to 8 cups. To determine the number of cups in a coffee pot that holds 2 quarts, multiply 2 quarts by 4 cups.

A quart is a unit of measurement that is equal to 4 cups of liquid. This means that a coffee pot that holds 2 quarts is equal to 8 cups. To figure out how many cups are in a quart, use the following equation: 1 quart = 4 cups. To determine the number of cups in a coffee pot that holds 2 quarts, multiply 2 quarts by 4 cups. The result is 8 cups. In other words, a coffee pot that holds 2 quarts is equal to 8 cups of liquid.

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The probability that a random sample of 106 pregnancies has a mean gestation period of 262 days or less is 0.00003.

What is probability?

Probability is a measure of the likelihood that an event will occur. It is a number between 0 and 1, where 0 represents an impossible event and 1 represents a certain event. Probabilities are usually expressed as fractions, decimals, or percentages.

(a) To find the probability that a randomly selected pregnancy lasts less than 262 days, we need to standardize the value using the formula z = (x - μ) / σ, where x is the value we're interested in, μ is the mean, and σ is the standard deviation.

z = (262 - 266) / 16 = -0.25

Using a standard normal distribution table or calculator, we find that the probability of getting a z-score of -0.25 or less is 0.4013. Therefore, the probability that a randomly selected pregnancy lasts less than 262 days is 0.4013.

(b) The sampling distribution of the sample mean length of pregnancies is approximately normal with mean μ = 266 and standard deviation σ = 16 / sqrt(51) = 2.2449. This is known as the central limit theorem.

Using a standard normal distribution table or calculator, we find that the probability of getting a z-score of -2.8304 or less is 0.0023. Therefore, the probability that a random sample of 51 pregnancies has a mean gestation period of 262 days or less is 0.0023.

(d) Using the same formula as in part (c), we have:

z = (262 - 266) / (16 / sqrt(106)) = -4.0077

Using a standard normal distribution table or calculator, we find that the probability of getting a z-score of -4.0077 or less is 0.00003.

Therefore, the probability that a random sample of 106 pregnancies has a mean gestation period of 262 days or less is 0.00003.

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The concept of the unit circle is presented throughout it's answer.

The unit circle is a circle with a radius of 1 unit that is centered at the origin (0,0) of a coordinate plane. It is a fundamental concept in trigonometry and geometry, and it is used to define the trigonometric functions (sine, cosine, and tangent) of angles in the Cartesian plane.

The format of each coordinate on the unit circle is given as follows:

[tex](\cos{\theta}, \sin{\theta})[/tex].

Hence we can calculate the trigonometric measures for any angle, as the tangent, the secant, the cossecant and the cotangent of an angle are all functions of the sine and the cosine obtained by the unit circle.

The problem is incomplete, hence the unit circle concept is presented in this answer.

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Madison will have $322.65 in her bank account in 10 years. Here is the calculation to find this amount:

Starting balance: $200

Year 1: $200 x 1.05 = $210

Year 2: $210 x 1.05 = $220.50

Year 3: $220.50 x 1.05 = $231.53

...

Year 10: $279.10 x 1.05 = $322.65

Therefore, after 10 years, Madison will have $322.65 in her bank account due to the annual interest earned.

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Answer:

0.032%

Step-by-step explanation:

192192/600600600 x 100% = 0.00032 x 100%

0.032%

Answer:

To find all the real zeros of a polynomial function algebraically, use the Rational Root Theorem to generate a list of possible rational zeros and use synthetic division to test each possible zero. The zeros that remain after testing all the possible zeros are the real zeros of the polynomial function.

To find all the real zeros of a polynomial function algebraically, you can use the Rational Root Theorem and synthetic division. The Rational Root Theorem states that if a polynomial function has integer coefficients, then any rational zero (i.e., a zero that can be expressed as a fraction) must have a numerator that is a factor of the constant term and a denominator that is a factor of the leading coefficient.

Here are the steps you can follow:

1. Write the polynomial function in descending order of degree, with all like terms combined.

2. Use the Rational Root Theorem to generate a list of possible rational zeros. This list will be a set of all the possible fractions that can be formed by dividing a factor of the constant term by a factor of the leading coefficient.

3. Use synthetic division to test each possible zero. Start with the smallest possible denominator and work your way up. If a possible zero is not a zero of the polynomial function, cross it off the list.

4. Repeat step 3 until all the possible zeros have been tested. The zeros that remain are the real zeros of the polynomial function.

For example, let's say we have the polynomial function f(x) = x^3 - 6x^2 + 11x - 6.

Write the polynomial function in descending order of degree: f(x) = x^3 - 6x^2 + 11x - 6.

Use the Rational Root Theorem to generate a list of possible rational zeros: ±1, ±2, ±3, ±6.

Use synthetic division to test each possible zero. We start with x = 1:

1 │ 1 -6 11 -6

│ 1 -5 6

└─────────────

1 -5 6 0

Since the remainder is zero, we have found a zero of the polynomial function at x = 1. We can write the factorization f(x) = (x - 1)(x^2 - 5x + 6).

Now we use synthetic division to test the other possible zeros:

2 │ 1 -6 11 -6

│ 2 12 46

└─────────────

1 -4 23 40

x = 2 is not a zero of the polynomial function.

3 │ 1 -6 11 -6

│ 3 15 78

└─────────────

1 -3 26 72

x = 3 is not a zero of the polynomial function.

-1 │ 1 -6 11 -6

│ -1 7 -4

└────────────

1 -7 18 -10

x = -1 is not a zero of the polynomial function.

-2 │ 1 -6 11 -6

│ -2 16 -50

└────────────

1 -8 27 -56

x = -2 is not a zero of the polynomial function.

-3 │ 1 -6 11 -6

│ -3 27 -102

└────────────

1 -9 38 -108

x = -3 is not a zero of the polynomial function.

6 │ 1 -6 11 -6

Hope this helps, I'm sorry if it doesn't! :]

Answer:

X = 90 , Y = 37 and Z = 53 Degrees.

Step-by-step explanation:

Z = 53 as opposite angles of a parallelogram are equal

Therefore, Z + Y + 90 = 180 ( Angle sum Property of a triangle)

= 53 + Y + 90 = 180
Y = 180 - 143
Y = 37

Now to find x , we know Y is the Alternate Interior angle of the angle adjacent to the 90*

Keeping that angle as "o"

Angle O = Angle Y by Alternate Interior Angle Therom

Therefore , Angle X + Angle O + 53 = 180 (ASP of triangle)

Angle X + 37 + 53 = 180

Angle X = 180 - 90
Angle X = 90*


In summary , X = 90 , Y = 37 and Z = 53.

Hope it helps.

Addressing issue at hand, we can state that the correct linear equation comparison symbol to the box. 10.09 10.9 f < = > is => 10.09 < 10.9

The algebraic equation y=mx+b is known as a linear equation. M serves as the y-intercept, and B serves as the slope. The previous clause has two variables, y and x, and is sometimes referred to as a "linear equation with two variables". Bivariate linear equations are those with two independent variables. The following are a few examples of linear equations: 2x - 3 = 0, 2y = 8, m + 1 = 0, x/2 = 3, x + y = 2, and 3x - y + z = 3. When an equation takes the form y=mx+b, with m denoting the slope and b denoting the y-intercept, it is referred to as being linear. The term "linear" refers to an equation having the form y=mx+b, where m stands for the slope and b for the y-intercept.

the correct comparison symbol to the box.

10.09 10.9

< = >

10.09 < 10.9

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Answer: 184 cm^2

Step-by-step explanation:

1st: separate the figure into smaller shapes

-> one large rectangle (20 cm x 7 cm) =140 cm

-> one triangle ( (15-7)= 1/2 (8 cm x 3 cm ) = (20-13-4) = 12 cm

-> one rectangle (4 cm x 8 cm ) = 32 cm

140 + 32 + 12 = 184 cm

Answer: 184 cm2

Step-by-step explanation: Break the shape into common shapes. If you continue the line of 13 cm you now have a rectangle and trapezoid.

The rectangle area is 140

20 x 7 = 140

The trapezoid area is 44

The 15 cm line is cut into 7 and 8

the height of the shape is now 8

Base A ( the top ) is 4 cm

Base B (the bottom) is 7

A = a+b over 2h = 4+7 over 2·8 = 44

now add the numbers