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The verb être is used for verbs of movement in the past, for examples verbs such as (aller- to go / sortir- to exit). Also for verbs suggesting a change of state (mourir - to die) 

ATP is constantly being produced in every mitochondrion of the cell, but it can't be stored within it. This is directly related to the properties of this important molecule - the phosphate bond between th...

I would recommend reading the questions before reading the extract as it directs your reading as you can begin to think about how the text applies to the questions asked.  When reading through, underline ...

A quadratic equations is a second-order equation with at most two solutions.The standard form of a quadratic equation looks like: ax² + bx + c = 0 . For instance if we have the equation x^2...

First, differentiate and put the derivative equal to zero. dy/dx=6x^2-30x+24=0. Solve this equation to get that x=4 and x=1. Substitute these values into the original equation to get the correspo...