Question 814229
1.) We say that 2 angles compliment each other if the sum of the two angles is equal to 90. Therefore, let angle A be the 1st compliment and angle B be 
the angle given as 18 + (3 x A) the sum of 18 + (3 x A) + A = 90; You now have a simple equation. solve for A to find the 1st compliment and then use that value to find the value of angle B

2.) We say that 2 angles supplement each other if the sum of the two angles is equal to 180. Use the same procedure: Angle A is (4 x B) B being A's compliment, therefore 4B + B = 90 , thus 5B = 90 hence B = 18 therefore A the supplement is 90 - 18 = 72; The supplement of A is 180 - 72 = 108

QED