posted by Kwame on .
In 1972, there were 3.4 trillion cigarettes purchased worldwide, and in 1984, there were 4.3 trillion cigarettes purchased worldwide(in trillions) in the year x, where x=0 represents the year 1972.
(a) Which of the following linear equations could be used to predict the number of trillions of cigarettes y purchased worldwide in a given year x, where x=0 represents the year 1972?
(b) Use the equation form part (a) to estimate the number of cigarettes purchased worldwide in the year 2008.
(c) Fill in the blanks to interpret the slop of the equation: The rate of change of cigarettes purchased worldwide with respect to time is _______ per_____. (include units of measurement.)
a) If x = 0 represents the year 1972, then x = 12 represents 1984.
If x = 0 or x = 12, the equation that fits would be D (substituting those two values for x and solving for y).
b) If x = 0 represents the year 1972, then x = 36 represents the year 2008. Substitute 36 for x in the equation and solve for y.
c) I'll let you figure out this one.