Why is pi considered an irrational number

What expression is equivalent to 1/2(2+3x-6)

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 effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.