Let C (t) be the total value of US currency (coins and banknotes) in circulation at time. The table gives values of this function from 1980 to 2000, as of September 30, in billions of dollars. Estimate the value of C (1990) .
Answers are in billions of dollars per year. Round your answer to two decimal places.
22.90
Mathematics
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Find the vertex, axis of symmetry, and y-intercept of the parabola that has the given focus and directrix.Focus 
, directrix y = 
A. 
, x = - 
, 
B. 
, y = 4, (0, 4)
C. 
, x = - 
, 
D. (-6, 4), x = - 
, (0, 40)
Mathematics
Classify the real number as a natural number, whole number, integer, rational number and/or irrational number. The number may belong to more than one set.-5971
A. whole number, integer, rational number B. natural number, integer, rational number C. integer D. integer, rational number
Mathematics
Simplify.
A. -4x9y
B. 
C. 
D. -4x8y
Mathematics
Use the graph to find the indicated function value.y = f(x). Find f(5)
A. 9 B. 2 C. 11 D. -11
Mathematics