Vector Fields in Maple. A vector field is described by a function that takes each point of the plane to a vector. > with(linalg): > F := (x,y) -> [-y,x]; We can evaluate this function at a point by plugging in values for x and y , just like we do with functions whose values are scalars.
The survey of U.S. parents finds that out of children participating in Fall and Winter sports, just 60 percent are wearing mouth guards. Taking a closer look at mouth guard usage for some higher-impact sports, the survey shows that for football, just 32 percent of parents report their child wears a mouth guard, for field hockey, just 14 percent. Lacrosse and ice hockey both fall at 11 percent, alongside volleyball. The complete list can be found here.
A wider group of people are now playing, including more family members, due to the increased variety of games. In fact, the ESA states: 1  About 35 percent of parents play computer and video games with their children weekly. Under 18 age group: This group makes up 32 percent of gamers. 2  If you thought the average gamer was a male from this group, you may be surprised to know that percentage-wise, females age 18 and older play more video games than males 18 and younger - 31 percent compared to 19 percent.