In february, alec had 1,571 visitors to his website. in march, he had 1,380 visitors to his website. what is the percentage decrease of the number of visitors to alec's website from february to march? if necessary, round to the nearest tenth of a percent. a. 12.2% b. 13.9% c. 13.8% d. 87.8%

Ineed to know the rule for the sequence. plz !

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

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog