A local outdoor equipment store is being sold. The buyers are trying to estimate the percentage of items that are outdated . They will randomly sample among its 100,000 items in order to determine the proportion of merchandise that is outdated . The current owners have never determined their outdated percentage and can not help the buyers . Approximately how large a sample do the buyers need in order to insure that they are 98 % confident that the margin of error is within 3%

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".

ou would have 12 of each