Which court case in 2013 struck down the formula for determine the states covered under the section 5 preclearance requirement of the voting rights act of 1965?

Plz which of the following provisions of the compromise of 1850 was designed to appeal to slave states? a. congress passed a strict fugitive slave law. b. the slave trade was banned in washington dc. c. texas agreed to give away some of its land so that the territory would be available for future states. d. california was admitted to the union as a free state.