The figure shows a circle with radius r сm. Another circle is drawn inside the circle such that its diameter is the radius of the original circle. The process is repeated infinitely. (a) Show that the sum of the circumferences of the first 10 circles is greater than 3.996πr cm.

(b) If the radius of the first circle is 8 cm, what is the sum of the circumferences of all circles?

(Express the answer in terms of π.)

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Which graph represents the equation y =4x

Ascatter plot with a trend line is shown below. which equation best represents the given data? y = x + 2 y = x + 5 y = 2x + 5