What is an expression for vector x involving vector r, vector s, and vector t?

options are:

-2r - s + t
-3r + s - t
r + -3s - t
-r + s - t

Which is a graph of a proportional relationship?

Kayla has a $500 budget for the school party.she paid $150 for the decorations.food will cost $5.50 per student. what inequality represents the number of students,s, that can attend the party?

If you could answer these your a life saver