Simple Tweening: Actionscript Problem

hey there, i have an assignment due in to university this friday and i’m having trouble getting two things to function correctly. i know these two problems are amateur as that is the level i am at, but any help to correct them would be really appreciated!

for the assignment i have been asked to create a simple city scene in which a car drives past on the road at the bottom and where the sky turns from daytime to night time.

i have created the scene and have encountered the following:

the sky goes from night to day (the wrong way round from how it should be) and the car, consisting of a rectangle and two circles for wheels, although using the same speed settings, goes across the screen with the body and wheels all going at different speeds.

…here is the code for the sky effect:

// make sky go from day to night
new Tween(skyBlack, “_alpha”, Smooth.easeIn, 100, 10, 30, true);

…and here is the code for the car:

// animate the car
new Tween(wheel1, “_x”, Soft.easeOut, 820, -220, 3, true);
new Tween(wheel2, “_x”, Soft.easeOut, 880, -220, 3, true);
new Tween(carBody, “_x”, Soft.easeOut, 820, -220, 3, true);

i have also been asked to make stars come out in random positions but that really scares me lol…

i have attatched the file in question so hopefully that will help.

thanks again for all feedback received!