a box contains chocolate and vanilla cookies the ratio of chocolate cookies to the number of vanilla cookies in the box is 5:9 what is fraction of the cookies are chocolate cookies

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".

only 10/60 isn't equivalent

hope this : )

it would take 5 hours i think idk i'm not that good at math.can you me with my questions i need asap.