-6 + (-8)= What’s the answer I need help I will give brainliest to who ever helps me!!.

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

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