1. When acertain tree was first planted, it was 4 feet tall, and the height of the treeincreased by a constant amount each year for the next 6 years. At the end ofthe 6th year, the tree was 1/5 taller than it was at the end of the4th year. By how many feet did the height of the tree increase eachyear?
A) 3/10 B)2/5 C)1/2 D)2/3 E)6/5
2. If $1,000 isdeposited in a certain bank account and remains in the account along with anyaccumulated interest, the dollar amount of interest, L, earned by the depositin the first n years is given by the formula L=1000*（（1+r/100）^n-1）. Where r percent is the annual interest rate paid by thebank. Is the annual interest rate paid by the bank greater than 8 percent?
1) The deposit earns a total of$210 in interest in the first two years
2) (1+r/100)^2>1.5作者: sumerlaws 时间: 2010-9-19 19:57
The size of a television screen is given as the length of the screen's diagonal. If the screens were flat, then the area of a square 21-inch screen would be how many square inches greater than the area of a square 19-inch screen?
