作业帮SAT两道数学题求解答!
来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/04/29 22:14:55
SAT两道数学题求解答!
1.At time t=0,a ball was thrown upward from an initial height of 6 feet. Until the ball hit the ground, its height, in feet, after t seconds was given by the function h above, in which c and d are positive constants. If the ball reached its maximum height of 106 feet at time t=2.5, what was the height, in feet, of the ball at time t=1?
答案是70
2.The Acme Plumbing Company will send a team of 3 plumbers to work on a certain job.The company has 4 experienced plumber and 2 trainees, how many different such teams are possible?
答案是24
哎呀傻了= =
方程：h(t)=c-(d-4t)^2
1.At time t=0,a ball was thrown upward from an initial height of 6 feet. Until the ball hit the ground, its height, in feet, after t seconds was given by the function h above, in which c and d are positive constants. If the ball reached its maximum height of 106 feet at time t=2.5, what was the height, in feet, of the ball at time t=1?
答案是70
2.The Acme Plumbing Company will send a team of 3 plumbers to work on a certain job.The company has 4 experienced plumber and 2 trainees, how many different such teams are possible?
答案是24
哎呀傻了= =
方程：h(t)=c-(d-4t)^2
第一题你没有把h那个方程写上来,题目中说上面给出了h的方程.
第二题就是个概率组合,怎么算都不是24啊.
如果是一个trainee带三个plumbers,就是8
如果是一个trainee带两个plumbers是12
如果不分plumbers和trainees,就是在6个人里面选3个,那就是20
再问： 我也是算了20！！！ 可是答案的确是写24的
再答： 那就是答案有问题吧。呵呵
再问： 应该也是~好心人能不能帮我看看第二题。。。
第二题就是个概率组合,怎么算都不是24啊.
如果是一个trainee带三个plumbers,就是8
如果是一个trainee带两个plumbers是12
如果不分plumbers和trainees,就是在6个人里面选3个,那就是20
再问： 我也是算了20！！！ 可是答案的确是写24的
再答： 那就是答案有问题吧。呵呵
再问： 应该也是~好心人能不能帮我看看第二题。。。