Jiang Li wants to know if her neighbors want the speed limit on their street reduced. She writes every house number on a piece of paper, puts it into a bag, and selects 15 papers. After surveying these households, she concludes that 75% of the people on her street want the speed limit reduced. Is this conclusion valid? Justify your answer.

the answer is vanilla

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.