ruler A with two scaled at each edge is a/n__ scale. Ruler B with a single scale marked at the edge is a/n ___ scale.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

hope it mark me as brainlieast.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

i need