As of February 1, a garage band knows 5 songs. Each week, the band members learn 2 more songs. Let n be the number of songs that the band knows at t weeks since February 1.
a. Identify the explanatory and response variables.
b. Find the slope and the n-intercept of a linear model.
c. Find an equation of the model.
d. Graph the model by hand.
e. How many songs will the band know on March 22 (7 weeks after February 1)?