Annual Federal Spending on Medicare Increased More or Less Linearly $s = 2 t + 42$

Multiple Choice

Annual federal spending on Medicare increased more or less linearly from $45 billion in 1973 to $87 billion in 1994. Use these data to express s, the annual spending on Medicare (in billions of dollars) , as a linear function of t, the number of years since 1973.

A) $s = 2 t + 42$
B) $s = 87 t + 45$
C) $s = 2 t + 87$
D) $s = 45 t + 2$
E) $s = 2 t + 45$