7-12 discrete math

7. A={1,2,3,4,5,{3,4,5},{3,4},{5,6,7}}. Select the correct value for A. a. 5 (b) 8 c. 7 d. 13 8. C={2,4,6,8,10,12,14} and D={2,3,4,5,6,7,9,11,12,13,15]. Select the set corresponding to CD. a. {2,4,6,12} b. {2,3,4,5,6,7,8,9,10,11,12,13,14,15) c. {3,5,7,8,9,10,11,13,14,15} d. {3,5,7,9,11,13,15} 9. Select the set that corresponds to the relation given in the matrix. Rows of the matrix are numbered 1 through 4 from top to bottom and columns are numbered 1 through 4 from left to right. a. {(2,1),(2,2),(3,3),(4,2)} b. {(1,2),(2,3),(2,4),(3,3)} c. {(1,2),(2,2),(2,4),(3,3)} 0000110000100100 d. {(2,1),(2,2),(3,3),(3,4)} 10. The domain of a relation R is the set of real numbers, x is related to y under relation R if [x]y. Select the description that accurately describes relation R. a. Symmetric b. Anti-symmetric c. Anti-reflexive d. Neither symmetric nor anti-symmetric 11. A restaurant cuts their pizzas into 8 slices per pie. Sam bought part of one pizza for lunch (i.e., less than 8 slices) and the store now bas x slices remaining in total. How many complete pizza pies did the store make? a. [8x b. {8x} c. [x/8] d. [x/8] 12. Graph G is defined by the arrow diagram. Select the properties that accurately describe the following sequence with respect to graph G:(2,3,1,3,4,2) a. Not a trail b. A path but not a trail c. A circuit but not a cycle d. A cycle but not a circuit