It depends on the size of the coffee cup.
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Ounces or milliliters.
There is some homework you just can't copy someone else's answer on - weighing things is one of them. You will have to actually pick up the cup and put it on the scale in order to weigh it.
9.4
It means to multiply the radius by itself: radius x radius
When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.