Googles revenue was $29 billion in 2010, and it increased by about $9 billion per year until

Question:

Google’s revenue was $29 billion in 2010, and it increased by about $9 billion per year until 2014. Let r be the annual revenue (in billions of dollars) at t years since 2010.
a. Identify the explanatory and response variables.
b. Find the slope and the r-intercept of a linear model.
c. Find an equation of the model.
d. Graph the model by hand.
e. Estimate Google’s revenue in 2014.