Let us analyze the evaporation rate along a river that was recently dammed. suppose the lake is currently 50 yards wide, and getting wider at a rate of 3 yards per week. as the lake fills, it gets longer, too. suppose it is currently 950 yards long, and it is extending upstream at a rate of 15 yards per week. assuming the lake remains approximately rectangular as it grows, find 50 950 yds yds the river the dam a) the current area of the lake, in square yards;

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".

it would take 7/10 of an hour too fill the pool.

step-by-step explanation: