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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.
6 answers 3 days ago Mathematics
• ## 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...
8 answers 4 days ago Astronomy & Space
• ## 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.
10 answers 4 days ago Astronomy & Space
• ## Is it possible to travel to exo-planets 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.
10 answers 4 days ago Astronomy & Space
• ## Define what it means for something to be "testable?"?

It means that it makes predictions that can be checked against future observations and potentially refuted if those observations disagree with predictions.
5 answers 2 days ago Mathematics
• ## What is the difference between heat and temperature?

9 answers 5 days ago Chemistry
• ## 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.
4 answers 18 hours ago Medicine
• ## What is the capacity of a water tank having L=4.7", W=3'.3" & H=1'.3"?

5 answers 18 hours ago Mathematics
• ## My mum has green eyes and my dad has blue eyes, why are my eyes brown?

Recessive genes maybe? Is that why?
5 answers 18 hours ago Biology
• ## 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?
13 answers 5 days ago Paranormal Phenomena
• ## Is there something goining around with severe diarreaha?

5 answers 18 hours ago Astronomy & Space
• ## 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.
6 answers 3 days ago Astronomy & Space
• ## Y= 0.65(1.3)^1.03?

6 answers 2 days ago Mathematics
• ## The MESSENGER spacecraft discovered _______ in craters near _______ of Mercury.?

iron, the poles carbon dioxide, the equator organics, the equator water, the poles
5 answers 20 hours ago Astronomy & Space
• ## 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
7 answers 3 days ago Chemistry
• ## 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.
7 answers 3 days ago Mathematics
• ## Grade 12 Physics Question?

F = ma
Force needed = (1250 + 2160) × 1.10 = 3750 N

b)
Minimum strength needed = 2160 × 1.10 = 2380 N
4 answers 1 day ago Physics
• ## Is there any possibility of turning off the sun a little?

Here is too hot. the sun should be bombarded to decrease the heat.
9 answers 4 days ago Astronomy & Space
• ## 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 leg-length 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