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Science & Mathematics

90÷9(83x2)?
Please explain why you get your answer, as I used BODMAS/BIDMAS but get both 5 and 20, depending on how i treat the bracket. I just need to know the rule on why it would be 5 and not 20? if 5 is correct 
Will the Sun explode in a supernova?
Best answer: much too low a mass. This has been known for over half a century. Minimum mass for a supernova is called the Chandrasekhar Limit for the University of Michigan astronomer and Nobel Prize winner who worked it out: about 1.6 solar masses. 
List some activities I can do to benefit the earth and stop pollution. I need at least 20 thanks?

Can 1 green eyed and 1 blue eyed parent make a grey eyed child?

Math Problem : Can I simplify x^8/3 divided by x^4/6 to x^12/6 by subtracting the exponents??

(2x+5) (−mx+9) = 0 In the equation above, m is a constant. If the equation has the solutions x = 5/2 and x = 3/2, what is the value of m?

Are viruses living cells?

Is outerspace flat?

Find the maximum/minimum value of the function y = 3x^2  12x.?

The sum of 3 is the consecutive even number 408. what is the largest number?

A rectangles length is three times it's width if it's perimeter is 164 cm, find the width?

Why can't I disappear, then reappear in another room?

Stuck! Find Tan(AB) given sin and cos?
Best answer: Well, cos(B) is certainly not 64/17,
as a cosine is always between 1 and 1.
Sin(A) is indeed 12/13, but cos(B) is 8/17.
Sin(AB) = sin(A)cos(B)  cos(A)sin(B)
= (12/13)(8/17)  (5/13)(15/17)
= (96 + 75)/(13*17) = 21/(13*17).
Cos(AB) = cos(A)cos(B) + sin(A)sin(B)
= (5/13)(8/17) + (12/13)(15/17)
= (40 + 180)/(13*17) = 220/(13*17).
Tan(AB) = sin(AB)/cos(AB) = 21/220,
which is the first of the suggested choices. 
Is there a conundrum that astronomers consider a Black Hole that the Picture showed?
Best answer: If you watch Veritasium, he created a video a day before the picture was released and very accurately predicted wha tot expect. Additionall he goes into detail about what we're seeing the physics behind it,a nd what's nto resoivled in the image
https://www.youtube.com/watch?v=S_GVbudd... 
What are gravitational waves made out of?

What is the equation of the line through (1,2) and (3, 1)?

How many steps (equations) would you use to determine the amount of energy needed to bring ice from 35 C to +70 C?

Is 5G a real danger to people or just scaremongering?
david icke was saying recently in his latest video on youtube that 5G technology causes people health problems. to me, this makes worrying watching as i already live with terrible nerves and anxiety and seeing things like this can be frightening to me....especially when you already 'jump' at the drop of a hat. i ask; all these reports about 5G being dangerous to people and causing health problems is this scaremongering or is 5G something to be worried about? im hoping someone can put my mind at rest.