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Mathematics 20 Online
OpenStudy (anonymous):

A charitable fund's balance is modeled by y = -4.1x2 + 7.1x + 145, where y is the balance and x is the years after 1996. If no money is added to the fund, in how many years will the fund have a balance of 0? Round to the nearest year. A. 6 years B. 7 years C. 8 years D. 9 years A charitable fund's balance is modeled by y = -4.1x2 + 7.1x + 145, where y is the balance and x is the years after 1996. If no money is added to the fund, in how many years will the fund have a balance of 0? Round to the nearest year. A. 6 years B. 7 years C. 8 years D. 9 years @Mathematics

OpenStudy (aravindg):

satellite help me after this

OpenStudy (anonymous):

your job is to solve \[-4.1x^2+7.1x+145=0\] you can use the quadratic formula, but working with such decimals in annoying, so you can either multiply by ten first ans write \[-41x^2+71x+1450=0\] or just cheat http://www.wolframalpha.com/input/?i=-41x^2%2B71x%2B1450%3D0

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