单项选择题

The average of x and y is 16 and the average of x, y, and z is 22. What is the value of z

(A) 16
(B) 22
(C) 34
(D) 45
(E) 66
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单项选择题
What is the area of the triangle in the figure below（）

(A) 4.5
(B) 9
(C) 10
(D) 12.5
(E) 20
单项选择题
According to the graph, which of the following is the best estimate of the total revenue from government funding in 1990（）

A．$60 million
B．$55 million
C．$45 million
D．$35 million
E．$30 million
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