Joyce and felix tested their reaction times. each person pressed a button as soon as a light turns on. they compared their reaction times with the average, represented by the zero mark on the number line. joyce's reaction time was 0.1 seconds below the average reaction time. the difference between joyce's reaction time and felix's reaction time was 0.3 seconds. plot all of the points on the number line that could represent felix's reaction time as compared to the average.

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".

step-by-step explanation: