Find two decimals that are equivalent to (8x100)+(3x1/10)+(6x1/100)

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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?

For what values of a is the sum of the fractions 2a−1 / 4 and a−1 /3 positive?