Rebecca, in a canoe can travel 12 km/h in still water. If she traveled 30 km downstream in the same time that it took to travel 15km upstream, what was the rate of the current?

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".

1/8 3/16 3/4

step-by-step explanation:

you put them as all the same denominator and multiply

3000000000000000000000

there is no answer sorry!

step-by-step explanation: