O Stretch Your Thinking A balloon vendor sold 225 balloons on Saturday. He sold red, yellow, and blue balloors, Hero
100 red balloons and 25 more red than blue, How many
yellow balloons did he sell?

X+ y = 5 ; x - y =3 solve using linear combination

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

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!