A. {9,10,11,12} 9 and 10 are elements of set A but 11 and 12 aren't elements of A. Subsets of A { } {1} {2} {3} {4} {5} {6} {7 } {8} { 9} {10} {1,2} {1,3} {1,4} {1,5} {1,6} {1,7} {1,8} {1,9} {1,10} {1,2,3} {1,2,4} {1,2,5}........ you can write like this using all the elements of A
Step-by-step explanation: 75% is 3/4 so you divide 450 by 3 to get 150. So you know for 1/4 the price is 150 dollars. Now that you know that you can multiply 150 4 times to get the full amount. 150*4=600
