Algibra 1 unit 1 easy stuff please help

Answer:

E. (20 × 9) - (3 × 2)

Step-by-step explanation:

The area of the shape can be calculated by using the expression in the following options:

A.

C.

D.

E.

I will give some examples for how we know these options are goving the area:

For option E;

We can draw a smaller polygon to complete the shape.

Then we can multiply height and width of the bigger shape and subtract the area of the smaller poligon (the red rectangle) from the area of the bigger poligon.

For option A;

It has same logic with option E, just missing the step, where it calculates the value of smaller polygon.

The probability that the true mean weight is 1 pound is 0.0806

In your quality control test, you found that the mean weight of an SRS of bread loaves was 0.975 pounds, and the                       P-value for the test was 0.0806.

Interpreting the P-value, assuming that the true mean weight of bread loaves produced at the bakery is one pound, there is a 0.0806 probability of obtaining a sample mean at least as far from 1 pound as 0.975 pounds (in either direction) just by chance in a random sample of 50 bread loaves.

The probability that the true mean weight is 1 pound is 0.0806. This means that there is an 8.06% chance of observing a sample mean of 0.975 pounds or less just by random chance when the true mean weight of bread loaves produced at the bakery is one pound.

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A relation R between the set of natural numbers and a set S defines a sequence if and only if it is a one-to-one function.

A relation R between the set of natural numbers and a set S defines a sequence if and only if it is a function, meaning that each natural number is associated with exactly one element in set S.

It does not necessarily have to be a bijection or a surjective function, but it must be a one-to-one function to ensure that no two distinct natural numbers are associated with the same element in set S.

Therefore, the correct answer is the option: A one-to-one function

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Answer: The equation is 5 - (3/5)cot(x) = (25 + √3)/5.

First, we can simplify the right-hand side by dividing both sides by 5:

(25 + √3)/5 = 5 + √3/5

Next, we can use the identity cot(x) = 1/tan(x) to rewrite the left-hand side:

5 - (3/5)cot(x) = 5 - (3/5)(1/tan(x)) = 5 - 3tan(x)/5

Now we have the equation 5 - 3tan(x)/5 = 5 + √3/5.

Subtracting 5 from both sides, we get:

-3tan(x)/5 = √3/5

Multiplying both sides by -5/3, we get:

tan(x) = -√3/3

Taking the arctangent of both sides, we get:

x = arctan(-√3/3)

Since the range of arctan is (-π/2, π/2), we need to add π to get the other solutions:

x = arctan(-√3/3) + π

x = arctan(-√3/3) + 2π

Using a calculator, we find that arctan(-√3/3) is approximately -0.5236 radians, so the solutions are:

x ≈ 2.6179 radians, 5.7596 radians, 8.9013 radians

Since we are looking for solutions between 0 and 2π, we can add or subtract multiples of 2π to get:

x ≈ 2.6179 radians, 5.7596 radians, 8.9013 radians, 11.0430 radians, 14.1847 radians, 17.3264 radians

These are the solutions to the equation 5 - (3/5)cot(x) = (25 + √3)/5 between 0 and 2π.

Step-by-step explanation:

The 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication is:

0.817 to 0.849.

Statistics is a branch of mathematics that deals with the collection, analysis, interpretation, presentation, and organization of numerical data.

a. To find the number of subjects who used at least one prescription medication, we can simply multiply the total number of subjects by the percentage who used at least one prescription medication:

3234 x 0.833 = 2690.22

Rounding this to the nearest whole number, we get:

b. To construct a 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication, we can use the following formula:

CI = p ± z*√(p(1-p)/n)

where:

p = proportion of adults who use at least one prescription medication = 0.833

n = sample size = 3234

z* = z-score corresponding to the desired level of confidence, which for a 90% confidence interval is 1.645

Substituting these values, we get:

CI = 0.833 ± 1.645√(0.833(1-0.833)/3234)

= 0.833 ± 0.016

Therefore, the 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication is:

0.817 to 0.849

This means that we can be 90% confident that the true percentage of adults in this age group who use at least one prescription medication falls between 81.7% and 84.9%.

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B. An odd number of data values will always have one middle value is true.

D. An even number of data values will always have two middle numbers is also true.

In an odd set of data, there will always be one exact middle number. But in an even set of data, there will be two middle numbers, and they will be the two numbers closest to the center.

So if the middle of {1, 2, 3, 4, 5} is 3 and the middle of {1, 2, 3, 4} is 2 and 3, the correct statements will be;

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The change of coordinate matrix A from basis α to basis γ is the product of the change of coordinate matrices B and C, or A = BC.

To find the relationship between matrices A, B, and C, follow these steps:

Recall the definition of a change of coordinate matrix. It's a matrix that allows us to transform the coordinates of a vector from one basis to another.

Note that to go from basis α to basis γ, we can first go from basis α to basis β, and then from basis β to basis γ.

Let v be a vector in V represented in basis α. To find the coordinates of v in basis γ, we can perform the following transformations:
- Multiply v by matrix C to get the coordinates of v in basis β: v_β = Cv
- Multiply v_β by matrix B to get the coordinates of v in basis γ: v_γ = Bv_β

Since v_β = Cv, we can substitute this into the equation for v_γ:
v_γ = B(Cv)

By associativity of matrix multiplication, we can rewrite the equation as:
v_γ = (BC)v

Notice that the matrix product (BC) is the change of coordinate matrix from basis α to basis γ, which is A. So, we have:
A = BC

In conclusion, the change of coordinate matrix A from basis α to basis γ is the product of the change of coordinate matrices B and C, or A = BC.

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The correct option is that C. Player A is the most consistent, with an IQR of 2.5.

The IQR is a spread metric that is less influenced by extreme values. It is the difference between the third (Q3) and first (Q1) quartiles. The quartiles for Player A are as follows:

Q1 = 2

Q3 = 4

IQR = Q3 - Q1 = 4 - 2 = 2

The quartiles for Player B are as follows:

Q1 = 2

Q3 = 5.5

IQR = Q3 - Q1 = 5.5 - 2 = 3.5

The IQR is regarded a better indicator of variability than the range since it is less impacted by extreme results. As a result, we may infer that the interquartile range is the best measure of variability for this data.

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The probability of landing on red is 4/11, the probability of landing on blue is 5/11, and the probability of landing on green is 2/11.

Since the spinner is divided into three sections, the sum of the areas of these sections must equal the total area of the spinner, which we can consider to be 1.

Let R be the area of the red section, B be the area of the blue section, and G be the area of the green section. We know that:

R = (2/5) * 1 = 2/5 (since the red section is 2/5 of the total area)

B = (1/2) * 1 = 1/2 (since the blue section is 1/2 of the total area)

To find the area of the green section, we can subtract the areas of the red and blue sections from the total area:

G = 1 - R - B = 1 - 2/5 - 1/2 = 1/10

Now, we can find the probability of each outcome by dividing the area of each section by the total area:

Probability of red = R / (R + B + G) = (2/5) / (2/5 + 1/2 + 1/10) = 4/11

Probability of blue = B / (R + B + G) = (1/2) / (2/5 + 1/2 + 1/10) = 5/11

Probability of green = G / (R + B + G) = (1/10) / (2/5 + 1/2 + 1/10) = 2/11

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The value that makes the equation true is A. 4.

A fraction is a given number expressed as it numerator divided by its denominator. For example; a/b where a is the numerator and b is the denominator. The types of fraction are: proper, improper and mixed fractions.

In the given question, let the required value be represented by t.

So that;

64/100 = 6/10 + t/100

find the LCM, to have;

64/100 = (60 + t)/100

cross multiply

100*64 = 100*(60 + t)

divide through by 100,

64 = 60 + t

t = 64 - 60

 = 4

t = 4

The value that makes the equation true is A. 4.

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The balance after 6 years on an account that pays 5.5% annual interest compounded continuously with an initial deposit of $975 is $1,356.19.

Continuous compounding involves calculating the interest earned on a principal amount continuously over time, which results in a higher overall balance than other compounding frequencies.

Using the formula A = Pe^(rt), where A is the final balance, P is the initial deposit, r is the interest rate, and t is the time, we can calculate the balance after 6 years as A = 975e^(0.055*6) = $1,356.19. Therefore, the correct answer is option D, $1,356.19.

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The change in concentration when T changes from 10 to 40 minutes is 0.20 mg/ml.

The given concentration function is

[tex]c(t) = (5t)/(2+t^3) + 0.05t[/tex]

To estimate the change in concentration when T changes from 10 to 40 minutes, we need to calculate the difference between c(10) and c(40) and express it in milligrams per milliliter.

We need to convert the given time units from minutes to hours. T = 10/60 = 1/6 hours and T = 40/60 = 2/3 hours. Now we can calculate c(1/6) and c(2/3) using the given function:

c(1/6) =

[tex](5(1/6))/(2+(1/6)^3) + 0.05(1/6) = 0.56 mg/ml[/tex]

[tex]c(2/3) = (5(2/3))/(2+(2/3)^3) + 0.05(2/3) = 0.76 mg/ml[/tex]

c(2/3) - c(1/6) = 0.76 - 0.56 =0.20 mg/ml. This means that the concentration of the drug in the bloodstream increases by approximately 0.20 mg/ml when the time changes from 10 to 40 minutes after taking the pill.

The actual change in concentration may vary depending on various factors such as the individual's metabolism, absorption rate, and dosage. It's always best to consult with a healthcare professional for accurate and personalized medical advice.

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Using the concept of inverse variation and provide a solution using the appropriate formula.
The intensity (I) of a light source is inversely proportional to the square of the distance (d) from the source. If the intensity of the light source is 100 units when the distance is 2 meters, what is the intensity when the distance is 5 meters?

The inverse variation formula can be written as I = k / d^2, where I is the intensity, d is the distance, and k is the constant of proportionality.

Determine the constant of proportionality (k) using the initial values.
I = 100 units, d = 2 meters
100 = k / (2^2)
100 = k / 4
k = 400

Use the formula with the new distance (5 meters) to find the new intensity.
I = 400 / (5^2)
I = 400 / 25
I = 16 units

The conclusion is stated as:
When the distance from the light source is increased to 5 meters, the intensity of the light decreases to 16 units. This problem demonstrates the concept of inverse variation, as the intensity of the light source is inversely proportional to the square of the distance from the source.

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Step-by-step explanation:

g(6) = 3 - 5(6) = 3 - 30 = -27

We know the value of function g at 1 single point, g(6) = -27.

That is not enough to know what function g is.

Since the problem states that g(6) = 3 - 5(6), the problem is trying to guide you into answering that g(x) = 3 - 5x, but this is simply an assumption.

Monopolists are firms that have control over the supply of a particular product or service in a market. Due to this control, they can charge higher prices than competitive firms, which can result in lower quantities sold.

One reason why a monopolist's marginal revenue is less than the sales price is due to the downward-sloping demand curve. As the monopolist increases its sales price, the quantity demanded decreases. This means that the revenue generated from each additional unit sold is lower than the revenue generated from the previous unit sold. In other words, the marginal revenue earned from each unit sold is less than the sales price. This occurs because the monopolist must lower the price of all units sold to sell additional units, which lowers the average revenue earned per unit.
To illustrate this, imagine a monopolist that sells widgets for $10 each. If the monopolist lowers the price to $9, it may sell 10 widgets, resulting in revenue of $90 ($9 x 10). However, if the monopolist maintains the $10 price and only sells 9 widgets, the revenue is $90 ($10 x 9). In this case, the marginal revenue for the 9th unit sold is $0, which is less than the sales price of $10. This is because the monopolist must lower the price of all units sold to sell the additional unit, resulting in a decrease in average revenue per unit. Overall, the monopolist's marginal revenue is less than the sales price due to the downward-sloping demand curve and the need to lower prices to sell additional units.


A monopolist, unlike firms in a competitive market, has significant market power due to the absence of competition. This allows the monopolist to control the market price of their product by adjusting the quantity supplied. When a monopolist wants to sell an additional unit, they must lower the sales price for all units, including the ones already being sold. This is because the demand curve faced by a monopolist is downward-sloping, meaning that in order to sell more units, the monopolist has to decrease the price.
Marginal revenue refers to the additional revenue gained from selling one more unit of the product. As the monopolist lowers the sales price to sell more units, two things happen: the revenue increases from the additional unit sold, but there is also a loss in revenue from the units that were sold at a higher price before the price reduction.

As a result, the marginal revenue is less than the sales price, since it takes into account not only the revenue from the additional unit sold but also the loss of revenue from lowering the price of all units. This relationship between the monopolist's pricing strategy and marginal revenue is a key factor in determining the monopolist's profit-maximizing level of output and price.

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The oscillations are bounded and can be controlled by adjusting the damping or the frequency of the excitation.

In mechanical vibrations, dynamic instability and resonance are two important phenomena that can occur in linear systems.

Dynamic instability occurs when a system becomes unstable due to the inherent properties of the system. In other words, if the damping in the system is insufficient to prevent oscillations, the system can exhibit dynamic instability. This can result in unbounded or exponentially growing oscillations, which can lead to failure of the system.

Resonance, on the other hand, is a phenomenon that occurs when the frequency of the excitation matches the natural frequency of the system. This can result in large amplitude oscillations, even if the external force is relatively small. In other words, resonance is a condition in which the system responds strongly to a periodic force that has a frequency close to its natural frequency. Resonance can cause large oscillations, which can be damaging to the system, especially if the frequency of the excitation is close to the natural frequency of the system.

The main difference between dynamic instability and resonance is that dynamic instability is a condition in which the system becomes unstable due to insufficient damping, while resonance is a condition in which the system responds strongly to a periodic force that has a frequency close to its natural frequency. In both cases, the system can exhibit large oscillations, which can be damaging to the system. However, in dynamic instability, the oscillations are unbounded or exponentially growing, while in resonance, the oscillations are bounded and can be controlled by adjusting the damping or the frequency of the excitation.

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If we have a large collection of apples with a normal distribution of weights with a mean of 9 ounces and a standard deviation of 2 ounces, we can expect that about 34.13% of the apples will weigh between 9 and 11 ounces.

To find the percentage of apples that can be expected to weigh between 9 and 11 ounces, we need to find the area under the normal distribution curve between these two values.

First, we need to standardize the values by subtracting the mean and dividing by the standard deviation:

z1 = (9 - 9) / 2 = 0
z2 = (11 - 9) / 2 = 1

Next, we can use a standard normal distribution table or calculator to find the area under the curve between z1 and z2. This area represents the percentage of apples that can be expected to weigh between 9 and 11 ounces.

Using a standard normal distribution table, we can find that the area between z = 0 and z = 1 is 0.3413. This means that approximately 34.13% of the apples can be expected to weigh between 9 and 11 ounces.

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Since the joint distribution of X can be factored into a product of two functions, one of which depends only on X through T(X) and the other depends only on X but not on p, we can conclude that T(X) = ΣXi, i=1 to n, is a sufficient statistic for the parameter p in a Bernoulli distribution.

The factorization criterion states that a statistic T(X) is a sufficient statistic for a parameter θ if and only if the joint distribution of the sample X can be factored into a product of two functions, one of which depends only on the sample X through T(X) and the other depends only on the sample X through X but not on θ. In other words, if we can write:

f(x1, x2, ..., xn; θ) = g[T(x); θ]h(x1, x2, ..., xn)

where g and h are functions that do not depend on each other, then T(X) is a sufficient statistic for θ.

Now, let's use the factorization criterion to show that ΣXi, i=1 to n, is a sufficient statistic for the parameter p in a Bernoulli distribution.

The probability mass function of a single Bernoulli random variable Xi is given by:

P(Xi = x) = p^x * (1-p)^(1-x) for x=0 or x=1

The joint probability mass function of n independent and identically distributed Bernoulli random variables X1, X2, ..., Xn is given by the product of their individual probability mass functions:

P(X1=x1, X2=x2, ..., Xn=xn) = p^Σxi * (1-p)^(n-Σxi)

Let T(X) = ΣXi, i=1 to n. Then, we can write:

P(X1=x1, X2=x2, ..., Xn=xn) = p^T(X) * (1-p)^(n-T(X))

This expression can be factored as:

p^T(X) * (1-p)^(n-T(X)) = [p^(ΣXi)] * [(1-p)^(n-ΣXi)]

Therefore, we can write:

P(X1=x1, X2=x2, ..., Xn=xn) = g[T(X); p]h(x1, x2, ..., xn)

where g(T(X); p) = p^T(X) * (1-p)^(n-T(X)) and h(x1, x2, ..., xn) = 1.

Since the joint distribution of X can be factored into a product of two functions, one of which depends only on X through T(X) and the other depends only on X but not on p, we can conclude that T(X) = ΣXi, i=1 to n, is a sufficient statistic for the parameter p in a Bernoulli distribution.

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The minimum and maximum heights that the ladder can safely lie against the wall is 6.7 and 6.99 meters.

The minimum and maximum height that the ladder can safely lie against the wall is

sin theta = perpendicular/hypotenuse

Now keeping the each value of theta with hypotenuse to find the perpendicular height.

sin 70 = perpendicular/7.1

Keep the value

Perpendicular = 0.94 × 7.1

Multiply the digits

Perpendicular = 6.7 meters

sin 80 = perpendicular/7.1

Perpendicular = 0.99 × 7.1

Perform multiplication

Perpendicular = 6.99 meters

Thus, minimum and maximum heights are 6.7 and 6.99 meters.

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When q is equal to 2, p is equal to 92.

If p is inversely proportional to the square of q, we can write:

[tex]p = k / q^2[/tex]

where k is a constant of proportionality.

To determine the value of k, we can use the given information that p is 23 when q is 4:

[tex]23 = k / 4^2[/tex]

[tex]23 = k / 16[/tex]

[tex]k = 23[/tex] × [tex]16[/tex]

[tex]k = 368[/tex]

Now we can substitute k into the equation for p in terms of q:

[tex]p = 368 / q^2[/tex]

To find p when q is equal to 2, we can substitute [tex]q = 2[/tex]:

[tex]p = 368 / 2^2[/tex]

[tex]p = 368 / 4[/tex]

[tex]p = 92[/tex]

Therefore, when q is equal to 2, p is equal to 92.

We can start by using the inverse proportionality relationship between p and q in the form of an equation:

[tex]p = k / q^2[/tex]

where k is a constant of proportionality. We can find the value of k by using the given information that p is 23 when q is 4:

[tex]23 = k / 4^2[/tex]

[tex]23 = k / 16[/tex]

[tex]k = 23[/tex] × [tex]16[/tex]

[tex]k = 368[/tex]

Now we can substitute the value of k into the equation and solve for p when q is 2:

[tex]p = 368 / 2^2[/tex]

[tex]p = 368 / 4[/tex]

[tex]p = 92[/tex]

Therefore, when q is equal to 2, p is equal to 92.

We are given that p is inversely proportional to the square of q, which means that as q increases, p decreases, and vice versa. This relationship can be expressed mathematically as:

[tex]p = k/q^2[/tex]

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Complete Question:

If p is inversely proportional to the square of q, and p is 23 when q is 4, determine p when q is equal to 2.

The probability of the randomly selected point is in the semicircle is equal to 0.1.

Side length of a square = 10inches

Radius of the semicircle = 3 inches

Area of the composite figure = sum of area of semicircle and the area of the square.

The area of the semicircle is equal to,

= (1/2)π(3 in)²

= 4.5π in²

The area of the square is,

=(10 in)²

= 100 in²

The total area of the composite figure is,

= 4.5π + 100

≈ 114.1 sq in (rounded to one decimal place)

The area of the semicircular region is half the area of the semicircle,

= (1/2)(4.5π)

= 2.25π sq in

The probability 'P' of randomly selecting a point within the semicircular region is,

P = (area of semicircular region) / (total area of composite figure)

⇒P = (2.25π sq in) / (114.1 sq in)

⇒P ≈ 0.0619

Rounding to the nearest tenth, the probability is approximately 0.1

Therefore, the probability of randomly selected point is a part of semicircle region is equal to 0.1( nearest tenth ).

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Answer: 12.4%

Step-by-step explanation:

I took the quiz

Answer:

c

Step-by-step explanation:

Substituting the point C in the given equation

[tex]= 2(4) + 3(-4)\\=-4[/tex]

Answer: (1, 5)

Step-by-step explanation:

Hope this helps! :)

20.44% of Container A is full after the pumping is complete.

Given that two containers hold water are side by side, both in the shape of a cylinder.

Container A has a radius of 13 feet and a height of 18 feet.

Container B has a radius of 11 feet and a height of 20 feet:

Container A is full of water and the water is pumped into Container B until Container B is completely full.

We need to find what is the percent of Container A that is full after the pumping is complete?

Volume of cylinder = π × r² × h

Volume of container A = 3042π ft³

Volume of container B = 2420π ft³

After the pumping is complete,

The volume in container B will be of 2420π ft³

In container A, it will be of 3042π ft³ - 2420π ft³, out of a total of 622π ft³.

Therefore, the percentage is:

622π / 3042π x 100% = 20.44%

Hence, 20.44% of Container A is full after the pumping is complete.

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The time it takes the ball to strike the ground after it is thrown, found using the kinematic equation, H = -16·t² - 24·t + 200 is approximately 2.86 seconds

We know  that,

A kinematic equation is an equation of the motion of an object moving with a constant acceleration.

The direction in which the ball is thrown = Downwards

Height of the building = 200 foot

Initial velocity of the ball = 24 ft./s

The kinematic equation that indicates the height of the ball after t seconds is, H = -16·t² - 24·t + 200

At ground level, H = 0, therefore;

H = 0 = -16·t² - 24·t + 200

-16·t² - 24·t + 200 = 0

-2·t² - 3·t + 25 = 0

t = (3 ± √((-3)² - 4 × (-2)×25))/(2×(-2))

t = (3 ± √(209))/(-4)

t =  (3 + √(209))/(-4) ≈ -4.36 and t =  (3 - √(209))/(-4)) ≈ 2.86

The time it takes the ball to strike the ground after it is thrown is approximately 2.86 seconds.

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The number of visits that Madelyn needs to make to the movie theater to earn a free movie ticket would be= 10.

The number of points that Madelyn received for just signing up with the movie theater = 70 points.

The number of points she earns for each visit = 4.5 points

The total number of points the she needs = 115 points.

Let the total visit she requires = n

That is;

70+4.5n = 115

4.5n = 115-70

4.5n = 40

n = 10

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Answer:

43.96 cm

Step-by-step explanation:

The circumference of a circle is given by the formula:

C = 2πr

where r is the radius of the circle and π is a mathematical constant approximately equal to 3.14.

Given that the radius of the circle is 7 cm, we can substitute this value into the formula and simplify:

C = 2πr

C = 2 × 3.14 × 7

C = 43.96

Therefore, the circumference of the circle is approximately 43.96 cm.

Both angles have the same measure of 34 degrees, therefore, both lanes are parallel based on the converse of alternate interior angles theorem. The correct option is: D.

Two interior angles that alternate each other along a transversal that crosses two parallel lines are said to be alternate interior angles, and they are congruent to each other.

Plugging the value of x, both angles indicated in the image are congruent to each other:

3x + 4 = 3(10) + 4 = 34°;

4x - 6 = 4(10) - 6 = 34°

Therefore, since they are congruent to each other, the lanes are parallel based on the converse of alternate interior angles theorem.

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