PLEASE HELP WILL MARK BRAINLIEST

Jay takes 4 hours to cover a two-stage journey On one occasion he averages 60 km/h and 80 km/h for the two stages whereas on anoter occasion he averages 45 km/h and 100 km Find the length of each stage.​

To find the sum of all left leaves in a binary tree, Python programming language is used and code is written in Phyton.

Here's the Python code to find the sum of all left leaves in a binary tree:

Class TreeNode:

def __init__(self, x):

self.val = x

self. left = none

self.right = None

def sum_of_left_leaves(root):

If not root:

return 0

# If the left child of the root node is a leaf node, add its value to the total

If root. left is root.left.left and not root. left.right :

returns root. left.val + sum_of_left_leaves(root.right)

# Recursively go left and right subtrees and add their left leaves to the sum

returns sum_of_left_leaves(root. left) + sum_of_left_leaves(root. right)

This code first checks to see if the root node is None. If so, return 0 as there are no leaves left to add.

Then check if the left child of the root node is a leaf node. If so, add that value to the total and recursively traverse only the correct subtree.

If the left child of the root node is not a leaf node, recursively traverse the left and right subtrees and add the left leaves of both subtrees to the total.

Finally, it returns the sum of the leaves on the left side of the entire binary tree.

To utilize this work, make a double tree utilizing the TreeNode lesson and call the sum_of_left_leaves to work, passing the root of the twofold tree as a contention. 

Here is an example of using the function:

# build a binary tree

root = tree node (3)

root. left = tree node (9)

root. right = tree node (20)

root. right.left = TreeNode(15)

root. right.right = TreeNode(7)

# compute the sum of the leaves on the left

sum = sum_of_left_leaves(root)

# print result

print(sum) # output:

twenty-four 

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It must be pointed out that to derive a scientifically-defensible conclusion, we would need more replicated (Study plots) studied over a longer time period.

The average population of two competing weeds over a square meter of ground in a Georgia field.

If we take the five years of rainfall given in the table as representative of the rainfall variability of the study area, then we can say that dry years are years with rainfall of 100 cm/year of less, whereas wet years are greater than 100cm/year.

We see from the table, that during the dry years, the chicory seems to be outcompeting the chicory.

So, given this limited information, we can predict that the chicory would dominate. However, it must be pointed out that to derive a scientifically-defensible conclusion, we would need more replicated (Study plots) studied over a longer time period.

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The table shows the average population of two competing weeds over a square meter of ground in a georgia field. The table also gives the average rainfall for five successive years. If there was an extended drought in this area, what would be a reasonable prediction?.

Table attached at the end.

Answer:

18.0277563773 yards

Step-by-step explanation:

Pythagorean Theorem is \(a^{2}\) + \(b^{2}\) = \(c^{2}\)

\(10^{2}\) + \(15^{2}\) = \(c^{2}\)

100 + 225 = \(c^{2}\)

325 = \(c^{2}\)

\(\sqrt{325}\) = \(\sqrt{c^{2} }\)

8.0277563773 = c

Answer:

Step-by-step explanation:

2x - 3x + 20 + 5x - 40 = 4       combine like terms

(2x - 3x + 5x) + (20 - 40) = 4

4x - 20 = 4      add 20 to both sides

4x = 24     divide both sides by 4

x = 6

To complete the tables, we multiply the given numbers:

First table:

Second table:

Now, to determine which option is less expensive we compute the total annual expenses for each case:

1.-Rental:

2.- Homeowner:

From the above calculations, we can conclude that the cheaper option based on the given annual expenses is to rent.

Renting is less expensive.

Answer:

23.99999 rounded 30

Step-by-step explanation:

4/3 x 18

The first term on the left-hand side represents the flux of the quantity D(pu δ) across the cell boundaries, and the second term represents the change of this flux within the cell.

To integrate the 1D steady-state convection-diffusion equation over a typical cell, we can start with the given equation:

D/dx(pu δ) = d/dx (rd δ/dx)

Here, D is the diffusion coefficient, p is the velocity, r is the reaction term, u is the concentration, and δ represents the Dirac delta function.

To integrate this equation over a typical cell, we need to define the limits of the cell. Let's assume the cell extends from x_i to x_i+1, where x_i and x_i+1 are the boundaries of the cell.

Integrating the left-hand side of the equation over the cell, we have:

∫[x_i to x_i+1] D/dx(pu δ) dx = D∫[x_i to x_i+1] d(pu δ)/dx dx

Using the integration by parts technique, the integral can be written as:

= [D(pu δ)]_[x_i to x_i+1] - ∫[x_i to x_i+1] d(D(pu δ))/dx dx

Similarly, integrating the right-hand side of the equation over the cell, we have:

∫[x_i to x_i+1] d/dx (rd δ/dx) dx = [rd δ/dx]_[x_i to x_i+1]

Combining the integrals, we get:

[D(pu δ)][x_i to x_i+1] - ∫[x_i to x_i+1] d(D(pu δ))/dx dx = [rd δ/dx][x_i to x_i+1]

This equation can be further simplified and manipulated using appropriate boundary conditions and assumptions based on the specific problem at hand.

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There are 350 different lineups that can be created.

The question here is regarding the possibility of different lineups given that there are two groups of players available - guards and forwards/centers. The coach wants to choose 2 of her guards and 3 of her forwards/ centers. To avoid an unbalanced lineup, she places the names of her 5 guards in one hat and the names of her 7 forwards/centers in a second hat. Then, she will randomly select 2 guards from the first hat and 3 forwards/ centers from the second hat.

In order to get the different possibilities of lineups, we need to calculate the total number of ways we can select the guards and the forwards/centers separately.

Total number of ways to select guards =\(5C_2 = (5 \times 4) / (2 \times 1) = 10\)

Total number of ways to select forwards/centers = \(7C_3 = (7 \times 6 \times 5) / (3 \times 2 \times 1) = 35\)

Thus, the total number of ways the lineup can be created is 10 × 35 = 350.

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Biking at 10 mph it takes kristen 1/4 an hour the train station to go to work.kristen then takes the train to work and it takes another 1/4 hour to get to work when the train travels 28 mph. how far does kristen travels to work Kristen travels a total of 9.5 miles to work.


1. First, we need to find the distance Kristen travels by bike. We can do this using the formula distance = speed × time. In this case, Kristen's speed is 10 mph and she bikes for 1/4 hour. So, the distance she travels by bike is:

Distance = 10 mph × 1/4 hour = 2.5 miles

2. Next, we need to find the distance Kristen travels on the train. Again, we use the formula distance = speed × time. The train's speed is 28 mph and it takes 1/4 hour to get to work. So, the distance traveled on the train is:

Distance = 28 mph × 1/4 hour = 7 miles

3. Now, we add the distances from both parts of the journey to find the total distance traveled:

Total distance = distance by bike + distance by train = 2.5 miles + 7 miles = 9.5 miles

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Answer:  \(y < -\frac{1}{2}x+3\)

This is the same as writing y < (-1/2)x+3

==============================================================

Explanation:

The dashed boundary line goes through (0,3) and (4,1)

Apply the slope formula for those two points

m = (y2-y1)/(x2-x1)

m = (1-3)/(4-0)

m = -2/4

m = -1/2

The slope of the dashed line is -1/2. The y intercept is 3. So we go from y = mx+b to y = (-1/2)x+3 to represent the equation of the dashed line. This is the same as writing \(y = -\frac{1}{2}x+3\)

We shade below the dashed line to represent the inequality \(y < -\frac{1}{2}x+3\). Points in the shaded region are solutions to the inequality. One example point is (0,0).

Note that we don't have "or equal to" as part of the inequality sign because we are not including points on the boundary. A solid line, rather than a dashed line, would include points on the boundary.

Answer:

Step-by-step expThe answer would be 18 because 36÷2 is 18.

\(\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}\)

Actually Welcome to the concept of Areas,

Let's divide the above map in to 2 parts , that is a rectangle and a triangle, and add both thier areas to get the area of the Nevada.

so we get as,

Area of triangle = 1/2*b*h

Area of triangle ==> 1/2*309*306 ==> 47277 mi^2

Area of rectangle = l*b = 205*309 ==> 63345 mi^2

Area of NEVADA = 47277 + 63345 = 110622 mi^2

hence the area = 110622 mi^2

Answer:

the approximate area of Nevada is 110,567 mi²

Answer:

7 bags of chips will cost $10.50.

Step-by-step explanation:

If four bags of chips cost $6, we can divide the total cost by the number of bags to find the cost per bag:

Cost per bag = $6 / 4 = $1.50

Therefore, each bag of chips costs $1.50.

To find the cost of 7 bags of chips at this rate, we can simply multiply the cost per bag by the number of bags:

Cost of 7 bags = $1.50 x 7 = $10.50

So, 7 bags of chips will cost $10.50.

Hope this helps! If not, I'm sorry. If you need more help, ask me! :]

Answer:

$10.50

Step-by-step explanation:

Lets call one bag of chips b

4b = 6$

Divide both sides by 4

b = $1.50

They want 7b

1.50 * 7 = $10.50

May I please have a Brainliest? I put a lot of thought and effort into my answers, so I would really appreciate it!

The Average Velocity (A.V) of car

is 8.33m/s .

This is a Right answer...

The blanks are filled as below

Collinear points are those that are situated along a single straight line.

Collinear points are those that are on a line either close to or far from another point, it can be more than two points.

While coplanar points imply lying on the same plane

In the diagram,

E, F, and G are collinear points

D, B, E, F, and G are coplanar points

A, B, and C are another collinear points

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Answer: I think the answer is 127 if it is wrong i am so sorry

Don't forget drop a heart.

Step-by-step explanation:

Answer:

i think 127

Step-by-step explanation:

sorry if its wrong

The derivative of of f(x) = 10 is 0

The derivative of a function is the measure of the rate of change of the function. They are fundamental to the solution of problems in calculus and differential equations.

Here the function is not changing as 10 is a constant. So, if f(x) = c where c is a constant then f'(x) = 0 as the derivative of a constant is always zero.

Mathematically:

           d(f(x))/dx = \(\lim_{h \to 0}\) (f(x+h) - f(x))/h

There  is no x to substitute for x + h so no difference is noticed:

             \(\lim_{h \to 0}\) (f(x+h) - f(x))/h =   \(\lim_{h \to 0}\) (10 - 10)/h = 0

Hence, the derivative of f(x) = 10 is 0

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Answer:

Step-by-step explanation:Find the GCD (or HCF) of numerator and denominator GCD of 2 and 3 is 1

Divide both the numerator and denominator by the GCD 2 ÷ 1 3 ÷ 1

Reduced fraction: 2 3 Therefore, 2/3 simplified to lowest terms is 2/3.

The exponential equation of the given statement will be equal to, 1262 ×\((2)^x\).

Mathematical expressions with two algebraic symbols on either side of the equal (=) sign are called equations.

This relationship is illustrated by the left and right expressions being equal. The left-hand side equals the right-hand side is a basic, straightforward equation.

As per the given information in the question,

Total number of downloads initially = 1,262

Let the number of months be x.

Then, the equation will be,

y = 1262\((2)^x\)

Here, y is the total number of songs.

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Given equation is a first-order nonlinear ordinary differential equation (ODE): y' - (x + y - 1)^2 = 0

What is differential equation ?

A differential equation is an equation that contains at least one derivative of an unknown function, either a normal differential equation or a partial differential equation.

This equation can be solved using various methods, such as numerical methods or analytical methods like the implicit function theorem or the method of characteristics. However, finding an exact solution can be challenging and may not always be possible.

If you would like to find an approximate solution to this ODE, you could use numerical methods such as Euler's method, Runge-Kutta method, or the finite difference method. These methods can provide a numerical approximation to the solution for a given range of x and a specified initial condition.

The given equation is a first-order nonlinear ordinary differential equation (ODE):

y' - (x + y - 1)^2 = 0

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He makes a profit in total of $8381

The store makes a profit of $29 per sweater.

Here, we have to calculate the profit per sweater, we need to find the difference between the selling price and the cost price (purchase price) of each sweater.

Given:

Number of sweaters bought = 17

Cost of buying 17 sweaters = $68

Selling price of 17 sweaters = $561

Profit per sweater = Selling price per sweater - Cost price per sweater

First, calculate the cost price per sweater:

Cost price per sweater = Total cost / Number of sweaters

Cost price per sweater = $68 / 17

Cost price per sweater = $4.

Now, calculate the profit per sweater:

Profit per sweater = Selling price per sweater - Cost price per sweater

Profit per sweater = $561 / 17 - $4

Profit per sweater = $33 - $4

Profit per sweater = $29.

The store makes a profit of $29 per sweater.

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Answer:

Step-by-step explanation:

3x+23/54

SOLUTION:

We are told that;

Ricky is planning to buy a $23,000 car. He can afford to put down a 20% down payment.

The down payment would amount to;

Thus, the down payment is $4600

Yes, the statement "if x is rational and y is irrational, then x + y is irrational" is true.

To understand why, let's break it down step by step:

1. First, let's define what it means for a number to be rational or irrational:
  - A rational number is a number that can be expressed as the ratio of two integers, where the denominator is not zero.
  - An irrational number is a number that cannot be expressed as the ratio of two integers.

2. Given that x is rational and y is irrational, we can express x and y as follows:
  - x = a/b, where a and b are integers and b is not zero.
  - y = c, where c is an irrational number.

3. Now, let's consider the sum x + y:
  - x + y = (a/b) + c

4. To prove that x + y is irrational, we'll assume the contrary, that is, x + y is rational. This means we can express x + y as the ratio of two integers:
  - x + y = p/q, where p and q are integers and q is not zero.

5. We can rewrite this equation as follows:
  - (a/b) + c = p/q

6. Rearranging the equation, we get:
  - (a/b) = (p/q) - c

7. Since (p/q) is a rational number and c is an irrational number, the right side of the equation (p/q) - c would be the difference between a rational and an irrational number.

8. However, the difference between a rational number and an irrational number is always irrational. Therefore, the right side of the equation is irrational.

9. This contradicts our assumption that (a/b) is rational, leading us to conclude that x + y must be irrational.

In conclusion, if x is rational and y is irrational, then x + y is always irrational.

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Let X be the number of fixed points of a random permutation of n elements. A fixed point is an element that remains in the same position after the permutation. Thus, the probability that an element is fixed is 1/n, and the probability that it is not fixed is (n-1)/n.

Using the linearity of the expected value, we can calculate the expected value of X as:

E(X) = E(X1 + X2 + ... + Xn) = E(X1) + E(X2) + ... + E(Xn)

where Xi is the indicator random variable that is equal to 1 if the i-th element is fixed and 0 otherwise. Since the probability of an element being fixed is 1/n, we have E(Xi) = 1/n. Therefore,

E(X) = n * (1/n) = 1

To find the variance of X, we need to compute E(X^2) - E(X)^2. We can use the fact that X^2 = X1 + X2 + ... + Xn, where Xi is the indicator random variable that is equal to 1 if the i-th and j-th elements are both fixed and 0 otherwise. Then,

E(X^2) = E(X1 + X2 + ... + Xn)^2 = E(X1^2 + X2^2 + ... + Xn^2) + 2 E(X1X2 + X1X3 + ... + X(n-1)n)

Since there is only one way to fix two elements out of n, we have E(XiXj) = 1/(n(n-1)). Therefore,

E(X^2) = n * (1/n) + n(n-1) * (1/(n(n-1))) = 1 + 1/n

Finally, the variance of X is

Var(X) = E(X^2) - E(X)^2 = 1 + 1/n - 1^2 = 1/n

Therefore, the variance of the number of fixed elements of a randomly selected permutation of n elements is 1/n.

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Answer:

the cafe served 6 regular coffees

Step-by-step explanation:

to get your answer you can multiply the percentage times the amount served in total

Total regular coffees served = 6.

A percentage is a number or ratio that can be expressed as a fraction of 100. If we have to calculate percent of a number, divide the number by the whole and multiply by 100. Hence, the percentage means, a part per hundred. The word per cent means per 100. It is represented by the symbol “%”.

Given,

Total coffees served = 20

No. of regular coffees = 30% of 20

                                     = 30/100 × 20

No. of regular coffees = 6

Hence, Kelly's café served 6 regular coffees.

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