A projectile fired into the first quadrant from the origin of a coordinate system will pass through the point (x, y) at time t according to the relationship where is the angle of elevation of the launcher and g is the acceleration due to gravity (32.2 feet/second). An artilleryman is firing at an enemy bunker located feet up the side of a hill that is feet away. He fires a round, and exactly seconds later he scores a direct hit.

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 first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8