Draw any line segment XY and take a point R on it. Through R, draw a perpendicular to XY using ruler and compasses? Anyone please help please. ​

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?