The half life of substance A is 18 18 years, and substance B decays at a rate of 30 30 % each decade. (a) Find a formula for a function () f ( t ) that gives the amount of substance A, in milligrams, left after t years, given that the initial quantity was 100 100 milligrams.

Which graph represents the following piecewise defined function?

Sam makes his sales calls according to a pattern. he travels either north or south depending on the calendar. some of his past trips were as follows: on february 17, april 24, june 10, september 19, and november 3 he drove north. on february 28, may 25, august 22, november 20, and december 18, he drove south. describe sams' pattern. in which direction will sam drive on oct4 and oct 24?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .