after a heavy rain, a river reached the edge of its banks. any more rain and there would be a flood after a few hours, the river went down 1/5 inch. theb another rainstorm hit and dropped 1/4 inch of rain. the river rises by 1/20 of amount of rain that falls. usr this rxpression -1/5 + 1/4/20/1 to find how the new water level compares to the riverbank. did the new rain cause a flood?

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".