Mrs. Hooper teaches piano lessons 5 days a week. She teaches for a total of 3 hours per day. How many minutes does she teach each week?

900 minutes a week

Step-by-step explanation:

60 minutes makes one hour

3 hours multiplied by 60 minutes is 180 minutes

180 minutes multiplied by 5 days is 900 minutes

Step-by-step explanation:

3 hours *60 minutes= 180 minutes

And if he teaches for 180 mins a day, then in 5 days he will teach:

180 mins*5 days= 900 mins

1/5^2 = 7.56/45

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".