Please answer a real answer I have 22 more questions to go

Asap (explain how you got it as well for brainliest)i tried 1: 2 and 2: 3 and they were wrong. picture of figure: in the figure below, the segment is parallel to one side of the triangle. the ratio of 12 to y is1: 21: 31: 42: 3

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm

Tan198=asin164=? how to solve this? ?