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.
First in, first out. A child's 20 baby teeth, which typically come in by age 3, usually fall out in the order in which they came in. That means the lower center teeth (lower center incisors) are usually the first to go, around age 5 or 6.eplace toothbrushes every two or three months to reduce harmful bacteria and keep them working at their best. And make sure your child sees a dentist twice a year. Most kids lose their last baby teeth around age 12 or 13, about the time the 12-year molars appear.