Folding
The Himalayas, Andes, and the Alps are examples of folded mountains. They are called fold mountains because of the compressive forces involved in two tectonic plates colliding.
To answer this item, we let x be the number that is not unknown in this item such that the situation in this problem can be expressed as follows,
x - 9.3 = 68.91
Adding 9.3 to both sides of the equation,
x - 9.3 + 9.3 = 68.91 + 9.3
Simplifying,
x = 78.21
The answer to this item is 78.21, this I think is the first choice except that it is mistakenly written as 7.21 only.
It might be D considering the location.
