The population of a local species of dragonfly can be found using an infinite geometric series where a1 = 30 and the common ratio is two fifths. write the sum in sigma notation and calculate the sum that will be the upper limit of this population.

The perimiter of a rectangle is 70 inches the legneth of the rectangle is 5 less than 3 times the width of the rectangle what is the width of the rectangle

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

Which of the following circles have their centers on the x-axis? check all that apply.