A car wash cleaned 36 cars in 3 hours. At this rate, how many cars will the car wash be able to clean in 7 hours?

84 cars because one hour is 12 cars so 12 x 7 is 84 cars

8121 because

130,000 divided by 16 is 8121

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".