Jasmine has taken an online boating safety course and is now completing her end of course exam As she answers each question the progress bar at the bottom of the screen shows what portion of the test she has finished she has just completed question 16 and the progress bar shows she is 20% complete how many total questions are on the test use a table diagram tape diagram or equation to justify your answer

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".