please tutor with solution and explanation so I can study it and understand on my own

Name: EXERCISE 1 A. Determine if the given ratios form a proportion [5 pts] 1] 3 :9 and 135 : 405 2] 5:12 and7:15 Business Mathematics Year} Room: 3] 0.4-5 : 0.6 and 60% : 80% 4) 2 $3? and2:3 5] 2. 25: 1.44 and 15:12 EXERCISE 2 B. Show that the cross products are equal [10 pts] H P so ch .6 1-7 1.02 21 : 840 = 67 : 2.680 8 : 0.?7 = 32 : 3.08 Date