How to Make MovieClip Appear Randomly Within a Certain Area?

[Guy71173]

I am making a baseball game and I'm having trouble with making the ball go to a random x and y position. I can make the ball be hit, but I want it to be random power. Like sometimes it goes far and sometimes it stays in the infield. But right now it only goes far. Here's the code:

onClipEvent (load) {
    i = 15;
    k = -Math.PI+Math.random()*Math.PI;
    this._xscale = this._yscale=50+Math.random()*100;
    this._alpha = 75+Math.random()*100;
    
}
onClipEvent (enterFrame) {
    
    rad += (k/180)*Math.PI;
    this._x -= Math.cos(rad);
    this._y -= i;
    if ((this._x>=movieWidth) || (this._x<=0)) {
    }
}
onClipEvent (enterFrame) {
    if (_root.hitball.hitTest(_root.leftfouline)) {
        trace("FOUL!");
    }
}

Any help is appreciated. Thanks.