Local winds are created by
a. differences in earth's gravity
b. convection cells in the atmosphere
c. air moving from low pressure to high pressure
d. changing temperatures above a single location

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.