Posted by linda on Sunday, December 5, 2010 at 8:03pm.
the number of cats that are homeless can be modeled by the equation N= 2.1t squared  82t + 95 where N is the number of cats that are homeless and t=0 set as the current year.Use the quadratic model to find the number of years from now until the number of homeless cats is equal to 15.need larger number of the two answers to the nearest hundredth.

algebra  Reiny, Sunday, December 5, 2010 at 8:44pm
2.1t^2  82t + 95 = 15
2.1t^2  82t + 80 = 0
solve using the quadratic equation formula, I got
t = 1.00 or t =38.05 
algebra  Carole, Sunday, December 5, 2010 at 8:54pm
N=2.1t^2 82t+95 Since N = 15,
15=2.1t^2 82t+95 Now get this quadratic into standard form by subtracting 15 from both sides
1515= 2.1t^2 82t+9515
0=2.1t^2 82t+80 I am not sure what methods you have studied to solve this yet, but I would use the quadratic equation. Where a = 2.1, b = 82 and c = 80
t= (b}ã(b^24ac))/2a
t= (82}6052)/(2(2.1))
t = 1.00 or 38.04
Largest would be 1.00