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.
Buying a mouth guard from your dentist may cost as much as $500, but ordering online can reduce the cost without any loss of quality. Depending upon the severity of your bruxism and your specific mouth guard needs, a custom mouth guard can cost $100-$200 when purchased online and will last 6 months to 5 years. When ordering your night mouth guard, it is important that you choose a guard that will best protect your teeth.