Tracy bought 5 trays of plants for $105. Each tray contained 12 plants.

Each plant cost the same amount.

Plants can be purchased individually.

How much more money will Tracy need to spend for 15 additional plants?

$1150

Step-by-step explanation:

If 5stray cost $105

X=$105 ×15 =$1575

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".