一道英文数学题,If a $25,000 machine depresses $800 per year or 10% of its original value each year,find a function that expresses the machine's value v after t years have passed.If this machine has no salvage value,what is the useful life of t

一道英文数学题,If a $25,000 machine depresses $800 per year or 10% of its original value each year,find a function that expresses the machine's value v after t years have passed.If this machine has no salvage value,what is the useful life of t 一道英文数学题.if three different circles are drawn on a piece of paper,at most how many points can be common to all three? 英文数学题一道如图 一道英文的微积分数学题 一道新GRE数学题If a写错了，是 a 一道A卷数学题. 一道用英语表述的数学题If [a] indicates the greatest integer less than a,then ( ).A、 a – 1 一道简单的英文数学题谢谢大家 一道数学题25 一道数学题123456789^25 sat数学题一道,正答是A. 一道数学题,求a.b. 一道数学题:已知|x-a| 一道数学题,命题a:”-1 求助一道简单的英文数学题!If -7 is subtracted from -12 the result is?答案到底是5还是-5啊 求高手解答 谢谢! 200分求一道数学题,求懂英文的高手If a projectile is fired from ground level with an initial velocity of ν ft/sec and at an angle of θ degrees with the horizontal,the range R of the projectile is given by the following formula.If ν = 9 一道英文数学题A sample space consists only of 2 events,A and B.Which of the following would we use to describe A and B if they cannot occur at the same time?a.Mutually exclusiveb.P (A and B)=0c.Collectively exhaustived.All of the above 一道英文数学题..if a＜b,then 3^2+4^2+5^2+12^2=a^2+b^2 (符号^是平方) is satisfied by only one pair of positive intergers (a,b).what is the value of a+b?