Evangeline and Riley were making their way to class yesterday, starting from the main doors of the school. This door is 30 m from the main stairs. They began walking at a steady pace, arriving at the stairwell in 2 minutes. When they got there, Evangeline realized that she forgot her math book in the hallway when she stopped at the sanitizer, which is 10 m from the door. They quickly went back to pick it up, arriving in 30 seconds and taking an additional 30 seconds to get the book. They return to the stairwell at a steady speed, arriving in one minute. The run up the stairs takes 30 terrifying seconds. They continued running to get to class, covering 30 m in one minute. Create a distance time graph to show their journey.

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".

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap