There are 6,000 hotel rooms in Sean's city. During a convention, 4200 of the hotel rooms were occupied. What percentage of the hotel rooms in the city were occupied during the convention?

4200/6000×100

two zero of the 6000 will cancel two zero of 100

6÷700 and 60

140 over 10

5÷140 and 10

then you divide

70/2

answer is

70%

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.