They are essentially asking us to solve:

Solving this equation for x tells us that it will take around 80.1 years for the materials in the vault to reduce to 357 pounds.
1. 24
2. 56
3. 15
4. 60
Hopefully this helps!
Answer: The approximate surface area of the larger pyramid is 159.31 ft².
Step-by-step explanation:
A pyramid is a solid,
And, When two solids are similar then the ratio of their surface area is the square of the scale factor of similarity.
Here, the scale factor of similarity

Thus, by the above property,

It is given that, the smaller pyramid has a surface area of 25.49 ft²,



