Bob likes to prepare personal pizzas. he begins with a circle of dough that is 12 inches in diameter. on top of the dough, he places slices of salami. all of the slices are round and have a 4-inch diameter. if bob doesn't overlap the slices or allow any of the slices to extend beyond the edge of the pie, what is the maximum number of salami slices he can add?

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".