单项选择题

What is the average of four consecutive odd numbers starting with 2n+1（）

A. 4
B. 2n+3
C. 2n+4
D. 2n+5
E. n+4

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单项选择题
The company at which Mark is employed has 80 employees, each of whom has a different salary. Mark’s salary of $43,700 is the second-highest salary in the first quartile of the 80 salaries. If the company were to hire 8 new employees at salaries that are less than the lowest of the 80 salaries, what would Mark’s salary be with respect to the quartiles of the 88 salaries at the company, assuming no other changes in the salaries
A. The fourth-highest salary in the first quartile
B. The highest salary in the first quartile
C. The second-lowest salary in the second quartile
D. The third-lowest salary in the second quartile
E. The fifth-lowest salary in the second quartile
单项选择题
The fabric needed to make 3 curtains sells for $8. 00 per yard and can be purchased only by the full yard. If the length of fabric required for each curtain is 1.6 yards and all of the fabric is purchased as a single length, what is the total cost of the fabric that needs to be purchased for the 3 curtains（）

A. $40.00
B. $38.40
C. $24.00
D. $16.00
E. $12.80
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