A certain population is modeled by the function p(t)= 50,000/1+4e^-0.5t

How do you write something in scientific notation?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )