Astarfish is attached to a rock 3 inches below the level of the water at a high tide at low tide the starfish is 1 inch above the level of the water which integer shows the starfish position at low tide

Integer that represent position of star fish at low tide is  +1 .

Step-by-step explanation:

we are given

At high Tide star fish is 3 inches below the level of water.

At low tide star fish is 1 inch above the level of water.

Now if we take level of water as 0 on number line of integers then distance above the level of water represented by positive integers and distance below the level of water represented by negative integers.

So, At low tide star fish position represented by positive integer that is +1 as it was above level of water.

Therefore, Integer that represent position of star fish at low tide is  +1 .

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".