What is x? where would i find it? 는 무엇이고 내가 그것을 어떻게 찾을까?

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)

Having a hard time understanding this question (see attachment).

Item 1 which question could the expression 1000n answer? let n = the number of gallons of gas used. how many miles per gallon did the car get driving 1000 miles? let n = the number of grams of food needed for each dog. how many grams of food are needed to feed 1000 dogs? let n = the number of people at the show. how many empty seats were there at the show if there are 1000 seats at the theater? let n = the number of seats at the theater. how many empty seats will there by if 1000 people come to the show?