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We use the imperfect to decribe actions in the past which used to happen regularly, for example: Iba al cine. This can be translated as, "I used to go to the cinema". It is also used to describe...

The accusative case is used when there is movement from one point to another. For example, in the sentence, "Ich gehe in die Stadt" which means "I'm going into town" we use the accusat...

Question: 5x² + 3x - 3y = 4, -4x - 6y + 5x² = -7.........Step 1: make the y-coefficient equal in both equarions: (y and not x because it has the lowest power so it is easier, but x w...

∫ u(dv/dx) dx = uv − ∫ v(du /dx)dx is the Integration by Parts formula. 

If you set u=lnx, differentiation (rememeber from tables) leads to du/dx= 1/x, and dv/dx=x and so v=x^2/2 (raise power by on...

First, convert the mass of the bullet into SI units -> 240g=0.24kg

The law of the conservation of momentum states that m₁v₁=m₂v₂. To find the speed of...