(Modeling) Solve the problem.Box Office Receipts  U.S. movie box office receipts, in billi...

(Modeling) Solve the problem.

Box Office Receipts  U.S. movie box office receipts, in billions of dollars, arc shown in 5-year increments from 1986–2006. (Source: www.boxofficemojo.com)

These receipts R are reasonably approximated by the linear model R = .28944y + 3.5286,

where x = 0 corresponds to 1986, x = 5 corresponds to 1991, and so on. Using the model, calculate the year in which the receipts reach each amount.

(a) $5.3 billion

(b) $7 billion