The course length of the boston marathon is about 4.2×104 meters. the course length of the iditarod trail invitational ultra-marathon is about 1.6×106 meters. about how many times as long is the course of the iditarod trail ultra-marathon as that of the boston marathon?

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01

Prove that quadrilateral is a rhombus.