Melanie's employer uses a formula to calculate the pension. a retiring employee will receive 3% of their average salary for the last five years of employment for every year worked. melanie is planning on retiring at the end of this year after 20 years of employment. melanie would receive this amount each year until her death. her salaries for the last five years are $27,900, $29,200, $31,400, $34,000, and $34,900. calculate her pension

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".