Bobby baked 18 cookies with 2 scoops of flour. With 4 scoops of flour, how many cookies can Bobby bake? Assume the relationship is directly proportional.

36

Step-by-step explanation:

half of 4 is 2, so the amount has been doubled. so multiply the amount of cookies by 2, and you get 36.

36

Step-by-step explanation:

Bobby can bake 36 cookies with 4 scoops of flour because (18/2)*4=36

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".