I delivered 3/8 of my newspapers in one hour and 4/5 of my newspaper the 2nd hour. How many of my newspaper did I deliver in my 2nd hour?

step-by-step explanation:

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

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".

the forst and 3rd

step-by-step explanation: