Eight quadrilaterals with markings are shown

The only energy released as a result is equal to two ATP molecules. Organisms can turn glucose into carbon dioxide when oxygen is present. As much as 38 ATP molecules' worth of energy is released as a result.

Why do aerobic processes generate more ATP?

Anaerobic respiration is less effective than aerobic respiration and takes much longer to create ATP. This is so because the chemical processes that produce ATP make excellent use of oxygen as an electron acceptor.

How much ATP is utilized during aerobic exercise?

As a result, only energy equal to two Molecules of ATP is released. When oxygen is present, organisms can convert glucose to carbon dioxide. The outcome is the release of energy equivalent to up of 38 ATP molecules. Therefore, compared to anaerobic respiration, aerobic respiration produces a large amount more energy.

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Answer:

Step-by-step explanation:

1 . )    54    =   9d

          54 / 9  =  9d  /  9

          d   =   6

2 . )     n   +    2    =    - 14   -   n

           2n    =     - 16

            n   =   - 8

∮C F ⋅ dr = ∬D curl F dA = ∬D 1 dA = 16π. Thus, the value of the line integral ∮C F ⋅ dr, where C is the given circle oriented clockwise, is 16π.

To evaluate the line integral ∮C F ⋅ dr using Green's theorem, we first need to calculate the curl of the vector field F(x, y) = (y - cos y, x sin y). The curl of F is defined as:

curl F = (∂F2/∂x - ∂F1/∂y) = (∂(x sin y)/∂x - ∂(y - cos y)/∂y)

Let's compute the partial derivatives:

∂F2/∂x = sin y

∂F1/∂y = -1 + sin y

So, the curl of F is:

curl F = sin y - (-1 + sin y) = 1

According to Green's theorem, the line integral ∮C F ⋅ dr around a closed curve C is equal to the double integral over the region D enclosed by C of the curl of F, i.e.,

∮C F ⋅ dr = ∬D curl F dA

Now, let's apply Green's theorem to evaluate the line integral over the given circle C: (x - 8)^2 + (y + 9)^2 = 16, oriented clockwise.

To apply Green's theorem, we need to find the region D enclosed by C. The given circle is centered at (8, -9) with a radius of 4. The region D can be visualized as the interior of the circle.

Since the curl of F is 1, the double integral becomes:

∬D curl F dA = ∬D 1 dA

The integral of the constant function 1 over the region D is simply the area of D. The area of a circle with radius 4 is π(4^2) = 16π.

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a. the polar coordinate r for point P, with r > 0 and 0 < θ < 180°, is approximately 5.0874. b. the Cartesian coordinates for point P are approximately (-1.4587, 4.8793). c. The curve does not pass through the origin when 0 < θ < 2π.

a) To find the polar coordinate r for point P, we substitute the given angle θ = 161.14° into the equation r = 7 + 2cosθ.

r = 7 + 2cos(161.14°)

Using a calculator, we can evaluate the cosine function:

r = 7 + 2(-0.9563)

r = 7 - 1.9126

r ≈ 5.0874

Therefore, the polar coordinate r for point P, with r > 0 and 0 < θ < 180°, is approximately 5.0874.

b) To find the Cartesian coordinates for point P, we can convert the polar coordinates (r, θ) to Cartesian coordinates (x, y) using the formulas:

x = rcosθ

y = rsinθ

Substituting r = 5.0874 and θ = 161.14° into the formulas, we have:

x = 5.0874cos(161.14°)

y = 5.0874sin(161.14°)

Evaluating the trigonometric functions:

x = 5.0874(-0.2868)

y = 5.0874(0.958)

x ≈ -1.4587

y ≈ 4.8793

Therefore, the Cartesian coordinates for point P are approximately (-1.4587, 4.8793).

c) To determine how many times the curve passes through the origin when 0 < θ < 2π, we need to examine the values of θ for which r = 0. When r = 0, it indicates that the curve passes through the origin.

Setting r = 0 in the equation r = 7 + 2cosθ:

0 = 7 + 2cosθ

Solving for θ, we have:

2cosθ = -7

cosθ = -7/2

The cosine function has values between -1 and 1. Since -7/2 is outside this range, there are no values of θ between 0 and 2π that satisfy the equation, and thus the curve does not pass through the origin.

In conclusion, for the given curve in polar coordinates with r = 7 + 2cosθ, point P has a polar coordinate r ≈ 5.0874 with θ = 161.14°, and its Cartesian coordinates are approximately (-1.4587, 4.8793). The curve does not pass through the origin when 0 < θ < 2π.

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The two probabilities in this case are:

P(red, then blue)  = 0.143

P(blue, then blue) = 0.095

Here we have a set of marbles.

6 red ones

5 blue ones

4 yellow ones

So we have a total of 15.

a) Let's find the probability of first drawing a red marble and then a blue one.

The probability for the red is given by the quotient between the number of red ones and the total number:

p = 6/15

Now we want a blue one, the probability is computed in the same way, but now we have 5 blue ones and 14 in total (we already took one)

q = 5/14

The joint probability is:

P(red, then blue) = (6/15)*(5/14) = 0.143

The other probability is just computed in the same way.

p = 5/15

q = 4/14

P(blue, then blue) = (5/15)*(4/14) = 0.095

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Answer:

2

Step-by-step explanation:

Use the area of a triangle, given 3 points formula:

A:  (x1, y1) = (0,4)

B:  (x2, y2) = (2,4)

C:  (x3, y3) = (-1,6)

Area = 1/2|x1y2 - x2y1 + x2y3 - x3y2 + x3y1 - x1y3|  

plug in all the coordinates

Area = 1/2|(0·4) - (2·4) + (2·6) - (-1·4) + (-1·4) - (0·6)|

         = 1/2|0 - 8 + 12 + 4 - 4 - 0|

         = 1/2|-8 + 12 + 4 - 4|

         = 1/2|4|

         = 2

a) To find the equation of a plane through a point with a given normal vector, we can use the point-normal form of the equation of a plane:

Equation: (x - x₀)(A) + (y - y₀)(B) + (z - z₀)(C) = 0

Answer :   a)  plane is 8x + y - z - 68 = 0. b) plane parallel to 2x - y - z = 1

C) (3, -1, 6) and (7, 4, 3) is 8x - 3y + 31z = 0.

Given point: (9, 5, 9)

Normal vector: 8i + j - k

Substituting the values into the equation, we have:

(x - 9)(8) + (y - 5)(1) + (z - 9)(-1) = 0

8x - 72 + y - 5 - z + 9 = 0

8x + y - z - 68 = 0

Therefore, the equation of the plane is 8x + y - z - 68 = 0.

b) To find the equation of a plane parallel to a given plane, we can use the same coefficients of the variables as the given plane. In this case, the plane is 2x - y - z = 1.

Equation: 2x - y - z + D = 0

Given point: (3, -1, -6)

Substituting the values into the equation, we have:

2(3) - (-1) - (-6) + D = 0

6 + 1 + 6 + D = 0

13 + D = 0

D = -13

Therefore, the equation of the plane parallel to 2x - y - z = 1 through the point (3, -1, -6) is 2x - y - z - 13 = 0.

c) To find the equation of a plane through the origin and two given points, we can use the cross product of the vectors formed by subtracting the origin from the two given points.

Given points: (3, -1, 6) and (7, 4, 3)

Vector 1: (3, -1, 6)

Vector 2: (7, 4, 3)

Cross product: Vector1 x Vector2 = (7 - (-1), 3 - 6, (4*6) - (7*(-1))) = (8, -3, 31)

Equation: 8x - 3y + 31z = 0

Therefore, the equation of the plane through the origin and the points (3, -1, 6) and (7, 4, 3) is 8x - 3y + 31z = 0.

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The first four terms of the Maclaurin series of f(x) are f(x) is [tex]9 - 4x + 6x^2 + (11x^3)/6[/tex]

To find the Maclaurin series of a function f(x) given its derivatives at x = 0, we can use the following formula:

f(x) = f(0) + f'(0)x + (f''(0)x^2)/2! + (f'''(0)x^3)/3! + ...

Given the values f(0) = 9, f'(0) = -4, f''(0) = 12, and f'''(0) = 11, we can substitute these values into the formula to find the first four terms of the Maclaurin series:

f(x) = 9 + (-4)x + (12x^2)/2! + (11x^3)/3!

Simplifying each term, we have:

f(x) [tex]= 9 - 4x + 6x^2 + (11x^3)/6[/tex]

Therefore, the first four terms of the Maclaurin series of f(x) are:

f(x) [tex]= 9 - 4x + 6x^2 + (11x^3)/6[/tex]

It's important to note that this series is an approximation of the function f(x) near x = 0. As we include more terms in the series, the approximation becomes more accurate.

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Option D is best supported by the data in the graph, demonstrating a consistent annual increase in the total number of employees over the given time frame.

Based on the information provided, the best-supported statement by the data in the graph is option D: "The total number of employees increased each year over the 6-year period."

The graph does not provide specific information about the number of part-time and full-time employees individually. Therefore, options A and B, which make comparisons between part-time and full-time employees, cannot be supported by the given data.

Option C states that the total number of employees was at its lowest point at the end of year 2. However, the graph does not explicitly show the year-end points, making it difficult to determine the exact timing of the lowest employee count. Without further evidence, option C cannot be conclusively supported.

On the other hand, the graph clearly shows an upward trend in the total number of employees over the 6-year period. Starting from approximately 100 employees at the beginning of year 1, the total number consistently increases over each subsequent year, reaching around 200 employees at the end of year 6. This pattern supports option D, indicating that the total number of employees increased each year over the 6-year period.

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Answer:

Step-by-step explanation:

[tex]c^{2}+b^{2} = (4+a)^2 \\c = \sqrt{6^2+4^2}\\ c = \sqrt{36+16}\\ c = \sqrt{52} \\c^2 = 52\\a^2 + 6^2 = b^2\\\\52 + a^2 + 36 = 16 + a^2 + 8a\\ 8a = 72\\a = 9[/tex]

Please mark my answer as brainliest .

a) The given integral is path-independent and its value is 1.

b) Applying Green's theorem, the area of the circle x² + y² = a² is πa².



a) The integral [(y + 2xy)dx + (x² + x)dy] from (1,2) to (0,1) is independent of the path. By evaluating it along two different paths, we obtain the same result of 1. Therefore, the integral is path-independent.

b) Applying Green's theorem to the circle x² + y² = a², we consider the vector field F = (-y/2, x/2). The line integral of F along the circle's boundary is equivalent to the area integral over the circle. Simplifying, we find the area of the circle as πa², where a is the radius. Thus, the area of the circle x² + y² = a² is πa².

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The equation that correctly models g(x) is given as follows:

[tex]g(x) = \left(\frac{1}{2}\right)^{x - 10} + 4[/tex]

A translation happens when either a figure or a function is moved horizontally or vertically on the coordinate plane.

The four translation rules for functions are defined as follows:

The parent function for this problem is given as follows:

[tex]f(x) = \left(\frac{1}{2}\right)^x[/tex]

The function g(x) was translated 10 units right and four units up, hence the definition is given as follows:

[tex]g(x) = \left(\frac{1}{2}\right)^{x - 10} + 4[/tex]

The graph is given by the image presented at the end of the answer.

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With the given information, the equation of the hyperbola can be expressed as: [tex]\frac{(x-1)^2}{4 } - \frac{(y-4)^2}{32} = 1[/tex]

The general equation of a hyperbola with center (h, k), vertex (a, k), and focus (c, k) on the x-axis can be written as:

[tex]\frac{(x-h)^2}{a^{2} } - \frac{(y-k)^2}{b^{2} } = 1[/tex]

From the question,

center is (1, 4),

vertex is (3, 4), and

focus is (7, 4).

The distance between the center and vertex is the value of 'a', which is 3 - 1 = 2.

The distance between the center and focus is the value of 'c', which is 7 - 1 = 6.

The value of 'b' can be found using the relationship

c² = a² + b².

Substituting the known values:

6² = 2² + b²

36 = 4 + b²

b² = 32

Plugging these values into the equation, we have:

[tex]\frac{(x-1)^2}{2^{2} } - \frac{(y-4)^2}{\sqrt{32} ^{2} } = 1[/tex]

Simplifying further:

[tex]\frac{(x-1)^2}{4 } - \frac{(y-4)^2}{32} = 1[/tex]

This is the equation of the hyperbola with the given center, vertex, and focus.

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Fred invested $10,000 in the 6% bond.

Now, The amount invested in the 6% bond is, "x" and the amount invested in the 9% bond is, "y".

Now, We have to given that;

Fred invested a total = $25,000,

Hence,

x + y = 25,000

And, The interest on 9% bond is $750 more than interest on the 6% bond,

Hence,

⇒ 0.09y - 0.06x = 750

Now, we can rearrange the first equation as,

x + y = 25,000

x = 25,000 - y

Substituting this into the second equation, we get:

0.09y - 0.06x = 750

0.09y - 0.06(25,000 - y) = 750

0.09y - 1,500 + 0.06y = 750

0.15y = 2,250

y = 15,000

Thus, Fred invested $15,000 in the 9% bond.

Hence, The invested in the 6% bond, we can get;

x + y = 25,000

x + 15,000 = 25,000

x = 10,000

Therefore, Fred invested $10,000 in the 6% bond.

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The area of the sidewalk is 84.78 square meters if a circular flower bed is 23 m in diameter and has a 3 m wide circular sidewalk.

A circular flower bed is 23 m in diameter and has a circular sidewalk around it that is 3 m wide. The area of the sidewalk is square meters. The formula used: The area of the circle is given by:

πr²

Here, r = (d + 2w)/2, where d is the diameter and w is the width.

Substitute the values of d, w, and π in the above formula to get the area of the circular sidewalk.

Diameter of circular flower bed = 23 m

Width of circular sidewalk = 3 m

Radius of circular flower bed, r = (23+3)/2 = 13 m

Radius of circular sidewalk = (23+3+3)/2 = 14 m

Area of the circular sidewalk = π(14² - 13²) m²= π(14+13)(14-13) m²= 3.14(27) m²= 84.78 m²

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Answer:

32ft^2

Step-by-step explanation:

V1=l*w*h

V1=4*2*5

v1=40

V2=4*2*1

V2=8

V1-V2=Volume of the solid

40-8=32

The decimal number 1490 can be represented as 10111011010 in binary notation.

To represent the decimal number 1490 in binary notation, we need to convert it into its binary equivalent. The binary system uses base 2, where each digit represents a power of 2.

To convert 1490 to binary, we can use the process of successive division by 2. Let's go through the steps:

Step 1: Divide 1490 by 2.

Quotient: 745

Remainder: 0

Step 2: Divide the quotient (745) from Step 1 by 2.

Quotient: 372

Remainder: 1

Step 3: Divide the new quotient (372) by 2.

Quotient: 186

Remainder: 0

Step 4: Divide the new quotient (186) by 2.

Quotient: 93

Remainder: 1

Step 5: Divide the new quotient (93) by 2.

Quotient: 46

Remainder: 0

Step 6: Divide the new quotient (46) by 2.

Quotient: 23

Remainder: 1

Step 7: Divide the new quotient (23) by 2.

Quotient: 11

Remainder: 1

Step 8: Divide the new quotient (11) by 2.

Quotient: 5

Remainder: 1

Step 9: Divide the new quotient (5) by 2.

Quotient: 2

Remainder: 0

Step 10: Divide the new quotient (2) by 2.

Quotient: 1

Remainder: 1

Step 11: Divide the new quotient (1) by 2.

Quotient: 0

Remainder: 1

Now, let's arrange the remainders obtained from the successive divisions in reverse order to get the binary representation:

1490 in binary notation: 10111011010

Therefore, the decimal number 1490 can be represented as 10111011010 in binary notation.

To verify this result, we can convert the binary number back to decimal to see if we obtain the original decimal number.

10111011010 in decimal:

(1 * 2^10) + (0 * 2^9) + (1 * 2^8) + (1 * 2^7) + (1 * 2^6) + (0 * 2^5) + (1 * 2^4) + (1 * 2^3) + (0 * 2^2) + (1 * 2^1) + (0 * 2^0)

= 1024 + 0 + 256 + 128 + 64 + 0 + 16 + 8 + 0 + 2 + 0

= 1490

The resulting decimal number is indeed 1490, which confirms that our binary representation is correct.

In summary, the decimal number 1490 can be represented as 10111011010 in binary notation.

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From the definition of equivalent form or expressions, the three equivalent forms of 6. 375 are [tex] \frac{51}{8}[/tex] , [tex] 6\frac{3}{8}[/tex] and 637.5%. So, option(d) is right one.

Two mathematical expressions are equivalent if they results the same result on solving and simplifying. For example, the two math expressions 2 × (10 – 8) and 8 ÷ 2 are also equivalent as both can be simplified to 4.

We have to determine the equivalent form of 6.375. Check the all values in options. The value of 637.5 percentage is equivalent to =[tex] \frac{637.5}{100}[/tex].

= 6.375

Also, [tex] \frac{51}{8} = 6.375[/tex]

and [tex] 6\frac{3}{8} = \frac{51}{8} = 6.375[/tex]

Therefore, all the above discussed expression are equivalent to 6.375.

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Complete question:

The attached figure complete the question.

a) To linearize the right-hand side (RHS) of the dynamical equation x = a₁x + a₂x² + bu + c around x = 0, we can use a Taylor expansion.

The Taylor expansion of a function f(x) around x = 0 is given by f(x) = f(0) + f'(0)x + f''(0)x²/2 + ..., where f'(0) represents the derivative of f(x) with respect to x evaluated at x = 0, and f''(0) represents the second derivative of f(x) with respect to x evaluated at x = 0.

In this case, the RHS of the dynamical equation is a₁x + a₂x² + bu + c. Taking derivatives, we have f(0) = c, f'(0) = a₁, and f''(0) = 2a₂. Therefore, the linearized RHS becomes a₁x + 2a₂x²/2 = a₁x + a₂x².

b) For the linearized system x = a₁x + a₂x², we need to design a linear controller u(x) that stabilizes the system. To do this, we can use a proportional controller of the form u(x) = -kx, where k is a positive constant. Substituting this controller into the linearized system, we obtain x = a₁x + a₂x² - bkx. Rearranging the equation, we get x(1 - bk) = a₁x + a₂x². This can be rewritten as x(1 - bk) = x(a₁ + a₂x). To ensure stability, we need the coefficient of x to have a negative real part, i.e., (1 - bk) < 0. This implies that k > 1/b. Therefore, by choosing a value of k greater than 1/b, we can stabilize the linearized system x = a₁x + a₂x².

c) To design a controller µ(x) for the continuous-time system x = a₁x + a₂x² + bu + c such that the RHS of the dynamical equation is linear, we need to cancel out the non-linear terms a₂x² and bu. One approach to achieve this is by choosing µ(x) such that µ(x) = -a₂x - b. By substituting this controller into the continuous-time system, the non-linear terms cancel out, resulting in the linear equation x = a₁x + c. This equation is linear and can be easily solved or analyzed. Therefore, by selecting µ(x) = -a₂x - b, we can design a controller that makes the RHS of the dynamical equation linear.

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Step-by-step explanation:

The set of all points equidistant from a point called the center.

Step-by-step explanation:

Definition: A circle is the set of all points in a plane that are equidistant from a given point called the center of the circle. We use the symbol ⊙ to represent a circle. The a line segment from the center of the circle to any point on the circle is a radius of the circle.

To find the centered form of the function f(x) = 11 centered at 0, we need to subtract the mean value of the function from the original function. Since f(x) = 11 is a constant function, the mean value is also 11.

The centered form of the function is given by f(x) - mean value = 11 - 11 = 0. This means that the centered form of the function f(x) = 11, centered at 0, is the constant function f(x) = 0.In symbolic notation, we can represent the centered form as f(x) = ∑n=0 (11 - 11) = ∑n=0 0 = 0. The summation notation indicates that we are summing up the difference between each term of the original function and its mean value, which is always 0 in this case.

The centered form of the function f(x) = 11 centered at 0 represents a function that is centered around the origin and does not deviate from it. It is a constant function with a value of 0 for all values of x.

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hello

the answer to the question is:

EB² = AB² + AE² ----> EB² = 8² + 9² = 64 + 81 = 145

----> EB = 12

Step-by-step explanation:

Using the rules of exponents:

6^7 / 6^3 =  6^(7-3) = 6^4

Therefore, the discount factor for one period with a rate of return of 6 percent is approximately 0.9434.

To calculate the discount factor for one period with a rate of return equal to 6 percent, you can use the formula:

Discount Factor = 1 / (1 + Rate of Return)

Substituting the rate of return of 6 percent (0.06) into the formula:

Discount Factor = 1 / (1 + 0.06) = 1 / 1.06 ≈ 0.9434

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We can be 90% confident that the true mean price of an adult single-day ski lift ticket falls within (46.65, 53.55) range based on the given sample data.

To calculate the 90% confidence interval for the mean price of an adult single-day ski lift ticket, we can use the formula:

CI = x' ± Z * (s / √n)

Where CI is the confidence interval, x' is the sample mean, Z is the Z-score corresponding to the desired confidence level (in this case, 90%), s is the sample standard deviation, and n is the sample size.

Given the data: 59, 54, 53, 52, 52, 39, 49, 46, 49, 48, we can calculate the sample mean (x') and sample standard deviation (s):

x' = (59 + 54 + 53 + 52 + 52 + 39 + 49 + 46 + 49 + 48) / 10 ≈ 50.1

s = √[((59 - 50.1)² + (54 - 50.1)² + ... + (48 - 50.1)²) / 9] ≈ 6.79

The Z-score for a 90% confidence level is approximately 1.645 (obtained from the standard normal distribution table).

Substituting the values into the formula, we have:

CI = 50.1 ± 1.645 * (6.79 / √10)

Calculating the values, the 90% confidence interval for the mean price of an adult single-day ski lift ticket is approximately:

CI = 50.1 ± 1.645 * (6.79 / √10) ≈ 50.1 ± 3.45

This gives us the interval (46.65, 53.55).

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Any number within this range, such as 13,501, 14,000, or 14,498, could be the actual number of turtle eggs tracked by the turtle watch.

To find the possible actual number of turtle eggs when rounded to the nearest thousand is 14,000, we need to consider the range of numbers that round to this value.

When rounding to the nearest thousand, we look at the hundreds digit. If the hundreds digit is 5 or greater, we round up; if it is less than 5, we round down.

Given that the rounded value is 14,000, we can conclude that the actual number of turtle eggs falls within the range of 13,500 to 14,499. This is because if we were to round up, the number would be closer to 14,500, and if we were to round down, the number would be closer to 13,500.

Therefore, any number within this range, such as 13,501, 14,000, or 14,498, could be the actual number of turtle eggs tracked by the turtle watch.

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To find the critical value for testing the owner's hypothesis about the median number of newspapers sold per day, we need to perform a hypothesis test using the sign test.

The sign test is a non-parametric test used to compare medians. In this case, we are testing whether the median number of newspapers sold per day is equal to 67. Since we have a sample size of 20, we need to find the critical value associated with the binomial distribution for n = 20 and a significance level of α = 0.05.

To find the critical value, we use the binomial distribution and the cumulative distribution function (CDF). The critical value is the largest value k for which P(X ≤ k) ≤ α.

Using a statistical table or software, we find that P(X ≤ 3) = 0.047 and P(X ≤ 4) = 0.088. Since P(X ≤ 3) is less than α = 0.05, but P(X ≤ 4) is greater than α = 0.05, the critical value is 3.

Therefore, the correct answer is A) 4, which represents the number of days with a median number of newspapers sold less than or equal to 67.

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To test the convergence or divergence of the given series, we can use the alternating series test. This test states that if the series alternates signs and the absolute value of each term decreases as n increases, then the series converges.

In this case, we have an alternating series with the terms (-1)^n * n^4 / (n^4 + n^2 + 1). Taking the absolute value of each term, we get n^4 / (n^4 + n^2 + 1), which is less than or equal to 1 for all n.
Also, the denominator of each term increases faster than the numerator, so the terms decrease in absolute value as n increases.
Therefore, by the alternating series test, the given series converges.
The alternating series test is a useful tool in determining the convergence or divergence of a series. It is a special case of the more general convergence tests such as the ratio test and the root test. In an alternating series, the terms alternate signs, which makes it possible to use the alternating series test to determine its convergence or divergence. The test checks whether the absolute value of each term decreases as n increases. If it does, and the terms alternate signs, then the series is said to converge. The test is particularly useful for series with alternating signs, such as the one presented in this question. By applying the alternating series test, we can conclude that the given series converges.

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The number of calculators ordered is 50, and the number of calendars ordered is 30.

let's denote the number of calculators as 'c' and the number of calendars as 'l'.

We can then set up the following equations:

Each employee receives either a calculator or a calendar, so the total number of items should equal the number of employees

c + l = 80

The total cost of the order is $900, with each calculator costing $12 and each calendar costing $10.

12c + 10l = 900

We can solve this system of equations using the elimination method.

Multiply Equation 1 by 10 to make the coefficients of 'l' equal:

10(c + l) = 10(80)

10c + 10l = 800

Subtract the modified Equation 1 from Equation 2 to eliminate 'l':

(12c + 10l) - (10c + 10l) = 900 - 800

2c = 100

c = 50

Substitute the value of c into Equation 1 to solve for l:

50 + l = 80

l = 80 - 50

l = 30

Therefore, the number of calculators ordered is 50, and the number of calendars ordered is 30.

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