Brian would like to attend camp with his friends this summer. His parents told him that he would have to
earn the money for the camp himself. Brian has decided
that he will mow the lawn each week to earn money. If
his parents give him $35.00 every time he mows the
lawn, how much money will he have after 8 weeks?

280

Explanation? $35.00 × 8 weeks = $280.00

                       So BRIAN will have 280 dollars by 8 weeks

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.