Jillian is using integer tiles to add 7 + (negative 2). she uses the steps below. step 1 7 positive tiles. step 2 7 positive tiles and 2 negative tiles. step 3 7 positive tiles and 2 negative tiles. 2 positive and 2 negative tiles are circled. step 4 7 + (negative 2) = 2 jillian has made an error. in which step does it occur? step 1 step 2 step 3 step 4