Agas station charged $2.20 for each gallon of gasoline. harry paid $12.10 for gasoline. how many gallons of gasoline did harry buy?

5.5 gallon of gasoline.

Step-by-step explanation:

A gas station charged for each gallon of gasoline = $2.20

Harry paid for gasoline = $12.10

We will divide total payment by the rate of one gallon of gasoline.

Harry bought gasoline =

                                     = 5.5 gallon

Harry bought 5.5 gallon of gasoline.

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".