Which equation can be used to solve the problem?
60 percent of what number is 30?
60x2 120
30x2 60
30-1 30
60-1 - 60
60-230
100-250
100x2 200
30x2 - 60

Step-by-step explanation:

You take 30 Times 100 then divide that by 60 and you will find x. X=50

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".