Working together, Bill and Tom painted a fence in 6 hours. Last year, Tom painted the fence by himself. The year before, Bill painted it by himself, but took three
times longer than Tom took. How long did Bill take when painting the fence alone?

21.4 i did it already for s1

step-by-step explanation:

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.

idk

step-by-step explanation:

its adding 5.5 each time

step-by-step explanation: