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.
16 percent of the teens and preteens who were victims told no one about it. About half of children ages 6-11 told their parents. Only 30 percent of older kids told their parents. Preteens were as likely to receive harmful messages at school (45 percent) as at home (44 percent).Older children received 30 percent of harmful messages at school and 70 percent at home.ource(s): kids committed suicide cyber bullying: https://trimurl.im/c59/how-many-kids-hav...