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 pretenderswhile chasing the clouds awayour hearts were ringingin the key that our souls were singingas we danced in the nightremember how the stars stole the night awayhey hey heyba de ya, say do you rememberba de ya, dancing in septemberba de ya, never was a cloudy dayba duda, ba duda, ba duda, baduba duda, badu, ba duda, baduba duda, badu, ba dudamy thoughts are with youholding hands with your heart to see youonly blue talk and loveremember how we knew love was here to staynow december found the love that we shared in septemberonly blue talk and loveremember the true love we share todayhey hey heyba de ya, say do you remember

What do you mean by that?