When stephanie’s light bulb did not turn on after she wired a circuit board, she asked her brother to use the same procedure to see if he got the same results.
which important step of scientific design is being modeled?
a. reevaluating
b. repetition
c. replication
d. revising

what are the options?

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion