?

In your opinion, what is the best way for Europe to address its population crisis? What are the main obstacles that you see in that solution? 

How has the increasing number of foreign workers in Europe been a result of declining fertility rates in Western European countries? What has been the impact of those foreign workers on the fertility rates of Western Europe?

Water is draining through a cone into a cylinder. The cone is 9 cm tall, with a radius of 3 cm. The pot is 15 cm tall with a radius of 4 cm. How fast is the water level in the cylinder changing when the cylinder has 42 cm^3 of water in it, the water level in the cone is 4 cm deep, and the water level in the cone is dropping at a rate of 1.6 cm/min?

I've drawn out a diagram to represent the situation and defined my variables like this:

h = height of cone (9)

r = radius of cone (3)

H = height of cylinder (15)

R = radius of cylinder (4)

t = time

v = volume of cone

V = volume of cylinder

I know that I must find:

dH/dt

When:

V = 42 and h = 3 and dh/dt = 1.6

I'm at the point where I'm writing equations to relate the variables but I'm super stuck. So far I only have:

H = .8356 when V =42 and R = 4

I'm having trouble conceptualizing how these rates and numbers are related to each other.

The problem goes something like this: A landscape architect wished to enclose a rectangular garden on one side by a brick wall costing $30/ft and on the other three sides by a metal fence costing $10/ft. If the area of the garden is 188 square feet, find the dimensions of the garden that minimize the cost.

So, I know that I essentially need to minimize the perimeter.

Area = L * W

We know that Area = 188

Perimeter = 2L + 2W

L = 188/W

Using substitution I get: P = 2(188/W) +2W

Then I found the derivative in order to find the critical points: P' = -376/w^2 +2

The critical point that I found that fits inside the practical domain was 13.711 which would make both L and W equal to 13.711 but the site is telling me that my answer is wrong. I have no idea where I'm going wrong with this problem, could anyone help me out?

I want to pull a random line from a text file rather than use inputFile.nextLine());

I'm very new to this stuff and am having some trouble with the homework. This code is supposed to convert Celsius to Fahrenheit and vice versa. I'm supposed to write a method that:

1. Has the method modifiers public static

2. Has the name convertTemp

3. Receives two parameters: the first is of type double, which you should call temperature, and the second is of type String, which you should call temperatureScale

4. The return of the method should be void

5. The body of the method should have an if, else-if, else statement. Depending on the value of the argument temperatureScale, the method should convert the value saved in the variable temperature from Fahrenheit to Celsius if temperatureScale is f, or convert temperature from Celsius to Fahrenheit if temperatureScale is c. If temperatureScale is neither f nor c, the method should print an error message. The skeleton of the if statement is the following:

if ( /* check if temperature scale is equal to the letter f */ ){

// code that converts from Fahrenheit to Celsius

// and prints the result to the screen

} else if (/* check if temperature scale is equal to the letter c */){

// code that converts from Celsius to Fahrenheit

// and prints the result to the screen

} else {

// code that outputs a message indicating that an incorrect

// option was selected

}

Declare a variable to hold the calculation result, and use the System.outprintln method to print to the screen the output of the calculation.

How much heat (in kJ) is required to warm 13.0 g of ice, initially at -14.0 ∘C, to steam at 109.0 ∘C? The heat capacity of ice is 2.09 J/g⋅∘C and that of steam is 2.01 J/g⋅∘C.

Calculate the amount of heat required to completely sublime 46.0 g of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.

Suppose that 1.08 g of rubbing alcohol (C3H8O) evaporates from a 65.0 g aluminum block.

If the aluminum block is initially at 25 ∘C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25 ∘C. Heat of vaporization of the alcohol at 25 ∘C is 45.4 kJ/mol

I keep getting this wrong, I don t know why.

Lithium reacts with nitrogen gas according to the following reaction:

6Li(s)+N2(g)→2Li3N(s)

What mass of lithium is required to react completely with 59.9 mL of N2 gas at STP?

Use the molar volume of a gas at STP to calculate the density (in g/L) of nitrogen gas at STP.

I keep doing something wrong but I don't know what, please help!

A balloon is inflated to a volume of 27.5 L at a pressure of 748 mmHg and a temperature of 29.9 ∘C. The balloon rises in the atmosphere to an altitude where the pressure is 390. mmHg and the temperature is -13.9 ∘C.

Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.

I keep getting the answer wrong, I don't know what I'm doing wrong.

How would I calculate the root mean square velocity of gaseous neon atoms at 25 ∘C ? I'm so confused.

The age of particles increases linearly with depth. As in the particle age increases 1000 years for every 17.8 cm of depth.

It sounds like the equation would be linear but there might also be more to it. What would the equation be?

When filling out job applications do I legally have to disclose that I've had a job before? Or can I just say that I haven't? Things ended badly with my previous employer and I'm afraid that that might prevent me from getting another job. So can I just say that I've never had a job before or is that illegal or unethical?

Calculate the book value of a three-year-old machine that cost $260,000, has an estimated residual value of $26,000, and has an estimated useful life of four years. The company uses double declining-balance depreciation.

I can do the Straight-Line formula and Units-of-Production formula just fine but I can't figure this one out.

I have no idea how to do these problems! Looking in the textbook doesn't help at all, can someone please explain this?

At the end of 2013, Fitness Guru has adjusted balances of $800,000 in Accounts Receivable and $55,000 in Allowance for Doubtful Accounts. On January 2, 2014, the company learns that certain customer accounts are not collectible, so management authorizes a write-off of these accounts totaling $10,000.

What amount would the company report as its net accounts receivable on December 31, 2012?

I want to buy a Betta fish but I will have to drive with it for 3 and half hours in the car. If I buy the fish the same day that I leave can I keep the fish in its little cup and transport it that way?

I want to edit 2 or more gifs into a sort of collage. I know how to interleave layers. I know that all gifs frames must be the same size and length. The only problem I'm having is positioning the gifs. I open one gif then link all of the images so that I can move it into position as one. But the problem occurs when trying to edit the second gif. How can I link all the layers to the second gif apart from the first? Every time I try the images all move together but I want the two gifs to stay separate. How do I do this?

I've been trying to rotate a video 90 degrees because its basically sideways, but every time I do it the video becomes incredibly small with black edges. Is there any way that I can rotate a video without causing this?