Callie solved this one-variable equation. when she was done, she tried to verify her answer, but found that it was wrong. can you find her mistake? 1/2 (4k+8)=10 1. 2k+16=10 2. 2k=-6 3. k=3 what was callie’s mistake? a: callie should have added 10 to both sides in step 2. b: in step 1, when callie distributed the 1/2 to the 8, she multiplied incorrectly. c: callie divided by 2 instead of multiplying by 2 in step 3. d: callie should have added 16 to both sides in step 2.