Which of the following equations are equations of circles? 1. (x+5) ^2 + (y+2) ^2=-4 2. 2x^2+y^2+15x-y+3=0 3. x^2+y^2+2x+10y-5+0 4. 3x^2+3y^2+12x+30y-6=0 5. x^2-y^2+20x+2y+9=0

Do you remember the 21st night of September?

Love was changing the minds of pretenders

While chasing the clouds awayOur hearts were ringing

In the key that our souls were singing

As we danced in the night

Remember how the stars stole the night awayHey hey hey

Ba de ya, say do you remember

Ba de ya, dancing in September

Ba de ya, never was a cloudy dayBa duda, ba duda, ba duda, badu

Ba duda, badu, ba duda, badu

Ba duda, badu, ba dudaMy thoughts are with you

Holding hands with your heart to see you

Only blue talk and love

Remember how we knew love was here to stay

Now December found the love that we shared in September

Only blue talk and love

Remember the true love we share todayHey hey hey

Ba de ya, say do you remember