Two students are reading a book. Mark reads 9 pages per day. Jennifer reads 7 pages per day and has already read 20 pages. Graph the system of equations that represents the amount of pages Mark and Jennifer have read.

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".

207/8 is the right

drop out of school or go to quizlet, quizlet is better

step-by-step explanation:

answer: 7

step-by-step explanation: