When an object is thrown upward, its height (S), in meters, is given (approximately) by the quadratic equation S= -512 + vt + h, where v is the upward initial velocity in meters/second, t is the time of flight in seconds, and h is the height above level ground from which the object is thrown. Johnny is standing on a platform 6 meters high and throws a ball straight up as high as he can at a velocity of 13 meters/second. At what time t will the ball hit the ground? The ball will strike the ground seconds after it is thrown.​

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".

is it 35

step-by-step explanation:

£56

step-by-step explanation: