How do u do scale problems using proportions

To find the scale factor of the drawing to the actual fence, first write a ratio that compares of the two quantities. Next, compare the quantities using the same units. Convert feet to inches by multiplying the ratio by the conversion rate of 1 ft = 12 in. Then, simplify the fraction

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".