我列出了答案，但是不知怎么解 6、A set of 15 different integers has a median of 25 and a range of 25, what is the greatest possible integer that could be in this set? 43 假设前七个数都是25，那么最大的数应该是25（median）＋25（range）＝50 7、when a certain tree was first planted, it was 4 feet high, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of tree increase each year? 2/3 我是这样求的4+6h=4+4h+1/5 h＝1/10 8、a certain library assesses fine for overdue books as follows. On the first day that a book is overdue, the total fine is 0.1. For each additional day that the book is overdue, the total fine is either increased by 0.3 or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue? 0.7 我是这样算的increased by 0.3，则第一二三四天，total fine为
0.1, 0.4,0.7,1。Doubled，则第一二三四天为0.1,0.2,0.4,0.8,则较低的为0.8 9、at a dinner party, 5 people are to be seated around a circular table. Two seating arrangement are considered different only when the position of the people are different relative to each other. What is the total number of different possible seating arrangements for the group? 24 10、what is the greatest common divisor of positive integers m and n? 1) m is a prime number 2) 2n=7m C 11、if each item in the sum a1+a2+----+an is either 7 or 77 and the sum equals 350, which of the following could be equal to n? 40 | 
