Javed downloaded from the internet two files that had a combined size of 696 megabytes. the size of the first file was 290 megabytes, and it took 5 minutes to download. assuming that the files downloaded at a constant speed, how long did it take for the second file to download?

a 2 minutes
b 4 minutes
c 7 minutes
d 12 minutes

he added 7 minutes to his download

Step-by-step explanation:

i'm not sure i quite understand, could you provide more information?

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.