sc：Expect___
A. to increase the rate this year by 10%.
B. That the rate will be increased by 10% this year.
math：
1. A rent car charges a fixed cost of 2$ add 0.75$ for every 1/2 mile or the fraction of 1/2 mile, if [x] 1.represents the least number that greater than x or equals to x. To run r miles, which equation is the total charge of the car?
A. 2+0.375[x]
B. 2+0.75[x/2]
C. 2+0.75[x]
D. 2+1.5[x]
E. 2+0.75[x/2]
2. 四边形ABCD, CD=21, 对角线是AC和BD交于E, 问是否 AE^2+BE^2>EC^2+ED^2?
A. BE=21
B. AC垂直于BD
3. 3^6x=8100, (3^3x-1)^3=?
Ans: 10/3
4. The area of the board of a rectangle picture is 196 square inches. the picture’s length is twice of its width. All the edge of the picture is 2 inches away from the edge of the board. What’s the length of the picture?
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