What does negative 7/2 minus 1/4 equal?

Question

This question im asking is part of my homework to find the coordinates of the orthocenter of the triangle but I just need the simple anwsers for my quedtion

Answer 1

-(7/2) -(1/4)=-(14/4) -(1/4)

=-15/4

or-3.75

Answer 2

 

-(7/2) -(1/4)=-(14/4) -(1/4)

 

=-15/4

 

or-3.75