问倒计时和生命点，as3

EN

var CURRENTCOUNT:int = 0;
var EQUA:int;
//WHERE I WANT TO PUT LINEAR EQUATION
EQUA = 34;//<==EQUATION GOES HERE???
var SPEED:int; 
SPEED = EQUA;
var COUNTDOWN:Number = 600;
var COUNTUP:Number = 0;
//TIMER
var myTimer:Timer = new Timer(SPEED,600);
myTimer.addEventListener(TimerEvent.TIMER,someFunction);
myTimer.start();
//INCREMENTING++
function someFunction(event:TimerEvent) {
//COUNTDOWN stops count going down, COUNTUP stops count going up
CURRENTCOUNT = COUNTDOWN - myTimer.currentCount + COUNTUP;
//Testing with only a text string to rule out cashing issues 
tx.text = String (Math.abs (CURRENTCOUNT));
}

SPEED=DISTANCE/TIME

//VoVf
V++;
COUNT = V*V/X;