Approximate the volume of the backpack that is 17in × 12 in × 4in if you need a picture i'll try to send it to

To find volume you multiply all three dimensions by one another. We can approximate this by multiplying the smaller ones first.

12*4=48    Now multiply 48 by 10.

48*10=480  We still have 7 to deal with, so we can multiply 48 by 2 and then by 5.

48*5=240
48*2=96

Now add the three together.

480+240+96=816.

Your answer is 816.

It is the top one. the answer is -7. that is smallest