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Science & Mathematics

Is this healing correctly?

Is it possible to finish a theatreengineering double major in four years?

Is flint stone,magnetic ?

How to papers stock solution for 5 ml?

Can some one tell me why I got this wrong?

How to simplify (2ax^2+3ax+2a)/(x+a)?
Answer is a(2x+1) but unsure how to get it 
Does science disprove the Jehovah's witness religion?

Does "nothing" exist?

Where did the apollo land on earth on return?

How would one solve this maths equation?

How are plants (intentionally) mutated?
Exactly what do people use to mutate them? 
If size is relative, how do we know that the Universe is not really small?
Best answer: The Universe was created as a small volume of mass and space which would appear as a dot in Our Creator's HEAVEN 
A person throws a rock straight up into the air. when it leaves the person speed 50 mph. What is it's acceleration?
A person throws a rock straight up into the air. At the moment it leaves the person's hand it is going 50 mph. When the rock reaches its peak, how fast is it going and what is the magnitude and direction of its acceleration? Ignore air drag. 
Math question?
Anyone mind showing how to express this into a formula: The sum of two and y equals the difference between 5 and z 
What is the probability of getting two correct numbers when numbers are randomly chosen from 190?

Is there life on the sun?
I was wondering, is it possible that there is life on the sun? I mean think about it. There is life on the ocean, underground, in the arctic. So why wouldn't there be life on the sun with animals that adapted to the environment? Maybe we can't see them because the sun is too bright. 
How do I do this math question? The example question is 3 2/5=2 7/5 How did they get there in the example?
Also, how would I answer the other questions? Like question 4,5,6 
Instead of boiling tap water to drink can you refrigerate water and it would be the same ?

How do I find θ from equation n=4(cos(θ))^2+(sin(θ))^2?
Best answer: 1) Use the Pythagorean Identity to express sinΘ in terms of cosΘ (or cosΘ in terms of sinΘ)
2) Replace sin²Θ with (1cos²Θ) to obtain a quadratic equation in cosΘ
3) Use your favorite technique to solve the quadratic equation for cosΘ in terms of n
4) Θ = arccos(cosΘ)
4cos²Θ + sin²Θ = n
4cos²Θ + 1  cos²Θ = n
3cos²Θ = n1
cos²Θ = (n1)/3
cosΘ = ±√[(n1)/3] : Real solutions exist only for 1 ≤ n ≤ 4
For any integer k:
Θ₁ = arccos(√[(n1)/3]) ± 2kπ
Θ₂ = arccos(√[(n1)/3]) ± 2kπ 
Esterification of propane 1,2,3 triol and unsaturated higher carboxylic acid produce?