数学PS题题目看不懂

judyenglishS

The sides of a square region,measured to the nearest centimeters ,are 6 centimeters long. The least possible value of the actual area of the square region is
36.00 sq com
35.00 sq com
33.75 sq com
30.25 sq com
25.00 sq com

rudder86

The sides of a square region,measured to the nearest centimeters ,are 6 centimeters long. The least possible value of the actual area of the square region is
正方形的边四舍五入到最近的厘米时6厘米，最小的面积可能是？

5.5*5.5 = 30.25

taohuaxian

我很菜哈 试着解一下：

题：是说一个正方形的地区 每边长四舍五入到最近的整数是6，求可能的最小实际面积

解：最小的能够四舍五入到最近的整数6的数是 5.5 面积是5.5x5.5=30.25 选D

judyenglishS

还有一题：最后一句话看不懂
An object thrown directly upward is ata a height of h feet after t seconds,where h =-16(t-3)^2+150
At what height, in feet ,is the object 2 seconds after it reaches its maximum height?
6
86
134
150
214
抛物线的顶点是（-3,150）所以its max heitght 应该是150，但是2 seconds after 看不懂

zhuzhu123

路过啊，哈哈一路飘过，一路飘红，人生很美好，一起向前看，前进前进




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shaoyipeng

t=3时 达到顶点 2 seconds after t=3 不就是t=5么～ 代入得h=86

DayDreamings

2分钟后就是5呗 150 -64