Answer:
M(F) = F + 78.4
Explanation:
* Lets explain how to solve the problem
- The monthly disposable personal income (DPI) increased
$78.4 billion in March 2006
- M is the disposable personal income at the end of March 2006
- M is a function of disposable personal income, F, at the end of
February 2006
∴ The function is M(F), where M(F) is the disposable personal income
at the end of March 2006 and F is the disposable personal income
at the end of February 2006
∵ The monthly disposable personal income (DPI) increased
$78.4 billion in March 2006
- That means the disposable personal income (DPI) in March is the
sum of the disposable personal income (DPI) in February and
$78.4 billion
∵ M and F both are in billions dollars
∵ M(F) in billions dollars
∴ M(F) = F + 78.4
# Remember : we don't have to put 78.4 × 10^9 because the three
terms of the function are in billion