The underlying rock ledge of canada's horseshoe falls is cut back about 2 feet each year by erosion. calculate how much the rock ledge will erode over a 7 year period of time

Hi There!

So the rock edge is cut back 2 feet each year by erosion and we have to figure out how much it will be cut back by 7 years using this knowledge so.

2 feet each year

2 + 2 + 2 + 2 + 2 + 2 + 2

or

7 x 2

=

14 so:

The Rock Ledge will have eroded 14 feet at the end of 7 years

Over a period of 7 years the rock ledge will erode 14 feet depending on the increase of erosion. 
Hope this helps!!!  :)  ;)