3. If 3, 12 and 28 are in proportional find the first proportional. 4. If A = {2,4,6,8,10,12} ,B = {3,6,9,12,15} and C = {1,2,3,4,5,6,7} then find
(A ∪ B) ∩ C .

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%