请问模考5section 6 30题
A certain money market account that had a balance of $48,000 during all of last month earned $360 in interest for the month. At what simple annual interest rate did the account earn interest last month?
a. 7%
b. 7.5%
c. 8%
d. 8.5%
e. 9%
杯具的是我连题目都没看懂~
4题
x is an integer greater than 500
比较 the value of the integer formed if the order of the digits in x is reversed 200
同样,不懂他在说什么……
section3
12题
比较 the standard deviation of the sample measurement 0,1,2,4,8 the standard deviation of the sample measurement 1,2,3,5, and 9
30题
which of the following cannot be a factor of 2的 i 次方*3的 j 次方
a. 6
b. 8
c. 27
d. 42
e. 54
Thanks a lot~
解答:
1、是存款和利息的问题。存款48,000,一个月的利息是360,问年利率。360*12/48,000=9%
2、左边是把x的各位数字反过来的数,应该是不能确定,选D。因为x=501的话反过来是105,小于200.而x=502反过来是205,大于200
3、比较标准差。左边每个数都比右边每个数小1,因此他们在坐标轴上只是平移了一下,标准差是不变的,因此选C
4、哪个数不能表示为2的 i 次方*3的 j 次方?显然是42,因为42=2*3*7,7无法用2和3表示。其他都可以
by xiaoyaozi
非常感谢~
by Xeniagogo但是第四题我还是不明白~ 题目还有个条件是 i & j 都是positive integers!!!
那8=2*2*2 跟3没有关系呀!~