a company uses two different sized trucks to deliver sand. The first truck can hold x cubic yards and the second truck y cubic yards. If the

You should be able to do some of this yourself.

What is x? what is y?   So what does x+y represent?

What is S? what is T?   So what dioes S+T represent?

Now think about what x*S would represent

and

what does y*T reptresent?

Now you can say waht x*S + y*T  would represent.

 

Give it a go !!