1. In 1920 the record for a certain race was 46.7 sec. In 1980, it was 46.1 sec. Let R(t)= the record in the race and t= the number of years since 1920.

a. Find a linear function that fits the data

b. Use the function in (a) to predict the record in 2003 and in 2006

c. Find the year when the record will be 45.8 sec

2 In 1990 the life expectancy of males in a certain country was 61.2 years. In 1996 it was 64.3 years. Let E represent the life expectancy in year t and let + represent the number of years since 1990.

The linear function E (t) that fits the data is E (t)=______ t +_________

Find an equation of the line containing the given pair of points

(1/6, -1/3) and (5/6, 1)

What is the equation of the line y=