What is the greatest common factor of the terms 8a and 3a

Susie wants to take her friend out for lunch. she wants to spend $9.75 each person. how much will she spend in all.

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?

Me because i don't understand how to do it.: )