To join Karate Klub, David must pay a monthly fee of $25 and an initial fee of
$200. If he chooses Kool Karate, he must
pay an initial fee of only $100 but
$35/month.
a) After how many months is the cost the
same at either karate club?
b) If David plans to try karate for
6 months, which club should he join?
c) If David decides to do karate for a year,
which club should he join?

Which expression is equivalent to 2x^2+7x+4?

What expression is equivalent to (2x-1)(x-3)?

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