Silvia was asked to find the Sin(D). Her response was 12/15 . The teacher said Silvia's answer is incorrect. What did she do wrong? How can she fix it?

be more specific

step-by-step explanation:

a = 11 : 4

b = 38

c = 1 for every 6

no because after the troops were pulled many blacks were killed by hangings lynchings and other cruel ways which in a way interrupted the reconstruction of the south and differed from the way abraham lincoln had an idea of reconstruction