Which of the following is the equation of a line perpendicular to the line y=-3/2x+4 passing through the point(3,9)?

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.