Pls help due today plsss

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !

Carli has 90 apps on her phone. braylen has half the amount of apps as theiss. if carli has three timesthe amount of apps as theiss,how many apps does braylen have? let b represent the number of braylen's apps and t represent the number of theiss's apps.