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Science & Mathematics

System of Equation  Math fun (10 points awarded to best answer) Good luck!?
Best answer: {3x + 4y = 14.
{y = 2x + 1
3x + 4y = 14 => Recall "y = 2x + 1" ==> 3x + 4(2x + 1) = 14 => 3x + 8x + 4 = 14 =>
=> 5x + 4 = 14 => 5x = 14  4 => 5x = 10 => x = 10/5 => x = 2.
Hence: y = 2 * 2 + 1 = 4 + 1 = 5. 
How do Space station produce water for the astronauts to drink? ?
Best answer: As you prefer answers that just link to a web page rather than appreciating people taking the time to answer you, why don't you google it? https://www.mentalfloss.com/article/6785... 
Is it possible to see a rainbow in the sky at nighttime?
Best answer: The moon is able to cast a feint rainbow. As with a daytime rainbow, the moon has to be behind you and there has to be rain in the distance. It is very feint, with little if any colour.Note that this is a totally different apparition to a halo, which is what you might see around the moon when you look directly at he moon. A halo is caused by light refracted through cloud or ice crystals. A "moonbow" is caused by light reflected by raindrops. 
Is it possible to travel to exoplanets with a near light speed spacecraft, considering the fact that they hundreds or even thousands of l?
Best answer: There is nothing in physics to suggest that it is possible to travel to anything outside our solar system in less than tens of thousands of years. Even then, whatever reaches it's destination will have been long since frozen over due to energy depletion in the extreme cold (minus 400 degrees F) of deep space.
Fortunately, it appears that those exoplanets you mention are nothing more than boring hunks of rock and ice or huge amorphous gas giants, of which we have plenty to study in our own solar system. Hence travel to other planetary systems is unnecessary, and we aren't missing out on anything of significance by staying here. 
Define what it means for something to be "testable?"?
Best answer: Provided we're talking about a scientific hypothesis...
It means that it makes predictions that can be checked against future observations and potentially refuted if those observations disagree with predictions. 
What is the difference between heat and temperature?

I just took 1 500mg of acetaminophen?
Best answer: You don't have to wait. You can safely take the maximum dose of both medications at the same time. Just don't mix aspirin with other NSAIDs such as ibuprofen, diclofenac or naproxen. 
What is the capacity of a water tank having L=4.7", W=3'.3" & H=1'.3"?

My mum has green eyes and my dad has blue eyes, why are my eyes brown?
Recessive genes maybe? Is that why? 
Which paranormal thing do you most wish was real?
Ghosts, telekinesis, fortune telling, mind reading, remote viewing, astral projection etc ........? What aspect would you like most to be something more than imaginary? 
Is there something goining around with severe diarreaha?

How can Flat Earthers still exist despite the footage from Felix Baumgartner's dive from Space?
Best answer: They'd just say it's a camera trick. All they have to do is provide the coordinates to where you fall of the edge. That's all they have to do and then we will all believe them, except there would then be a small group of nutters called the sphere earth society. 
Y= 0.65(1.3)^1.03?

The MESSENGER spacecraft discovered _______ in craters near _______ of Mercury.?
iron, the poles carbon dioxide, the equator organics, the equator water, the poles 
When did you first realize fluoride is a poisonous chemical that doesnt belong in water?
Nothing like a good ol pineal gland detox of poisonous fluoride 
Jennifer wants to purchase 36 doughnuts. She has $140 dollars.?
Each rounded frosted doughnut costs $3 each and frosted filled doughnuts is $4.Jennifer wants to purchase 36 doughnuts. She has $140 dollars. What 2 different mathematical equations can we use to solve the answer to this problem. 
Grade 12 Physics Question?
Best answer: a)
F = ma
Force needed = (1250 + 2160) × 1.10 = 3750 N
b)
Minimum strength needed = 2160 × 1.10 = 2380 N 
Is there any possibility of turning off the sun a little?
Here is too hot. the sun should be bombarded to decrease the heat. 
Area of shaded region.?
Best answer: So basically you're going to find the area of the triangle first then subtract the area of the missing rectangle from it. Keep in mind that those dashed lines are also a part of the triangles leglength too. Therefore:
The Triangle's base is : 3 m + 4 m = 7 m
The Triangle's height is: 4 m + 2 m = 6 m
Now that we found its leg values, lets find the area for this triangle:
Area of a triangle: (1/2) * (Base) * (Height)
A = (1/2) * (7 m) * (6 m) = 42 m² / 2
Lets simplify this fraction:
= 21 m²
Now that we found the area of the triangle, lets find the area of the rectangle:
Area of a rectangle: (Length) * (Width)
The values are also already given to you, so lets simply plug in:
A = 4 m * 2 m
= 8 m²
Now just subtract the area of the rectangle from the area of the triangle:
21 m²  8 m²
= 13 m²
This is your final answer. 
Why is the moon round up if the Earth is flat?
Best answer: Because the Man in the Moon Vomited Earth up