I need to find the derivative using chain rule for g(x)=10(5)^-x

For what values of x is x2 + 2x = 24 true?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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