Laura found 12 shells on a trip to the beach. these shells represent 1/4 of the shells in her whole collection. how many shells does laura have in her whole collection

Can someone check my answer? you : )

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

What is the total surface area of this square pyramid?