Plz help!! its not 82 and 71 combined its 8 and then 2/3

8 2/3 - 7 1/8

explanation

The answer would be 1 13/24

You want to do
8 2/3
7 1/8
———
But you have to have the same denominators so you (x) 1/8 by 3 and 2/3 by 8 to get

8 16/24
7 3/24
————
Then you just subtract 16 and 3 to get 13 and subtract 8 and 7 to get 1 so the answer would be 1 13/24

The lateral side of a triangular pyramid is a triangle. in order to increase the lateral surface area, the slant height and the height should be altered