Number of proper subsets = 2^number of elements- 1
= 2^n - 1
No of elements = 4
2^4-1 = 16-1 = 15
21, it says it right in the name.
See attached picture for answer
Step-by-step explanation:
You must write formulas regarding the volume and surface area of the given solids.





Step-by-step explanation:
Using the properties of logarithms, the left side of the equation becomes

while the right hand side becomes

so we end up with
