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

Question

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

aravindg · Answer

satellite help me after this

anonymous · Answer

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