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The atomic radius of an atom is the distance from the atom's nucleus to its outermost electron. Moving across Period 3, the number of protons in the nucleus increases - for example sodium has 11 protons, ...

x₁ = (-b + (b² - 4ac)^1/2)/2a and x₂ = (-b - (b² - 4ac)^1/2)/2a. So with the values a = 1, b = 3 and c = 2: x₁ = (-3 + (3^{2 <...}

x²+2x+1=0, (x+1)(x+1)=0, (x+1)²=0. So x=-1

When using the auxilary "avoir" the past participle's ending agrees both is gender and number with the direct object only when it is placed before the verbs' subject.  Here's an example: Le chat...

I recommend using study cards.  Write down the spanish word on one side and the english word on the other side. Set yourself the task of learning 5 words a day and ask someone to test you.