Someone pls me with this: jack thomas has an fudge sundae with 450 calories. how long would it take him to burn off the calories by running at (5mph) and walking at (2mph)?

I’m stuck on this i don’t understand.

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?