Answer:

Step-by-step explanation:
The initial dimensions of the paper are:
(length)
(width)
After the paper is cut along the diagonal, we remain with a right triangle, of which the length and the width corresponds to the base and the height.
For a triangle, the area is calculated as

where
b is the base
h is the height
Here we have:

Therefore, the area of the triangle is:

Answer: 8
Step-by-step explanation:
Given
Money deposited 
Interest rate 
Time period 
For a year simple and compound interest is the same

Thus, interest earned is 8 units
Answer:
16/21
Step-by-step explanation: 4 x 3 = 12, 3 x 7 = 21, 13/3 - 25/7 raise to the first common denominator, 91/21 - 75/21 = 16/21