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If you have studied Physics, you may be familiar with the small angle approximation cos θ ≈ 1 - θ²  / 2. This is a surprisingly accurate approximation for small values of theta (try it!), but w...

Dans Entre les Murs le système scolaire est présenté dans une manière très négative à cause du fait qu’il échoue tous les élèves dans le collège. C’est vrai qu’il y a des élèves très faible dans ...

Cell membrane - semi-permeable barrier, allowing some substances in but not otherscytoplasm - material in the cell which contains dissolved salts, minerals and organelles. mitochondria - Where respiration...

The cell membrane consists of a phospholipid bilayer. Phospholipids are molecules with a hydrophilic (water loving) tail. And a hydrophobic (water repelling) tail. The cell environme...

by completing the square we write the equation as (x+b/2)^2-b/2^2+c, in this case b=8 (the coefficient of x) and c=5 so we have (x+4)^2-16-5=0, which equals (x+4)^2-21=0. Now by rearranging we get (x+4)^2...