Number of proper subsets = 2^number of elements- 1
= 2^n - 1
No of elements = 4
2^4-1 = 16-1 = 15
We have to add 8/15 to 2/5.
To add two fractions we have to make them have the same denominator, so we have to convert 2/5 to have a denominator of 15. To do this, we have to multiply 2/5 by 3 and then we can add the fractions:

Answer: 14/15
Answer:
the slope is 0
Step-by-step explanation:
You first do -9--9 and then divide 14-8
The pebble slowly falls and it's in the middle of the surface and bottom