What is the change in elevation from 140 feet above sea level to 40 feet below sea level? explain

140 feet above sea level can be seen as +140 because it is 140 higher than sea level which is 0.

40 feet below sea level can be seen as -40 because it is 40 below 0.

The difference would be 180.

This is best seen when visualizing a numberline. You start at the 140 mark and go all the way to negative 40 resulting in 180.

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80

step-by-step explanation:

what is the figure? attach a picture.