A student must leave for campus in 10 minutes or he will be late for class. Unfortunately, he is snowed in. He can shovel the driveway in 20 minutes, and his brother claims to be able
to do it in 18 minutes. If they shovel together, how long will it take to clear the driveway?
Will this give enough time for the student to get to the campus?

false.

step-by-step explanation:

false.

cavalieri's principle makes that statement about the volumes, not about the areas.

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.