Suppose that 3 and 8 are the only individual scores that can be made in a certain game of darts.( I suppose it's only possible to make ZERO points by missing the target entirely every time you throw).List all the total scores that are impossible to obtain.
someone please help

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters