Answer:
1. f(x,y) = (x, -y) 2. f(x,y) = (-x,y).
Step-by-step explanation:
I hope that helps
d/4 + d/6=45/60 hours=3/4 hoursStep-by-step explanation:
3d+2d=12 x 3/4=9
5d=9
d=9/5 km ……………….