4. The mean life of a battery is 50 hours with a standard deviation of 6 hours with an approximately normal shape. The
manufacturer advertises that they will replace all batteries that last less than 40 hours. If 50,000 batteries were
produced, how many should they expect to replace? Use the population standard deviation.

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".

sorry but i cant draw that