ok we are the victoms of a stupid math teacher..we can use a calculater but not just find all of the awnsers with it ..we must use a arithmatic formula..
this is the problem:
A woman begins working for a salary of 30,000 per year and gets a $2,000 raise each year. How many years must she work in order for her total earnings to reach 1 million dollars?
We think that it might be 1000000=n(30,000+an)/2
THIS IS DUE TOMORROW SO PLEASE HELP US>...this is not a joke.......
2006-12-17 08:37:06 · 2 answers · asked by Leah 1 in Science & Mathematics ➔ Mathematics
We r very sorry our math teacher isn't stupid were just very frustrated.
2006-12-17 08:43:47 · update #1
I would have helped you no problem if only you hadn't considered your maths teacher "stupid" for setting such a problem. Change your attitude.
2006-12-17 08:41:10 · answer #1 · answered by Anonymous · 0⤊ 0⤋
It would be an arithmetic sequence because there's the constant difference ( 2K) between consequitive elements. So, if you can add an arithmetic sequence then you can solve this problem.
I actually don't remember the formula for summing an arith. series!
I think that it might be
Sn = An(An+2000)/2 ,
where An = 30k+(n-1)2000
So, substitute for Sn and An, and solve for n, right?
That's if I've done it right!
2006-12-18 18:18:16 · answer #2 · answered by modulo_function 7 · 0⤊ 0⤋