David drives from his home to the airport to catch a flight. he drives 35 miles in the first hour, but realizes that he will be 1 hour late if he continues at this speed. he increases his speed by 15 miles per hour for the rest of the way to the airport and arrives 30 minutes early. how many miles is the airport from his home?

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)

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.

no

step-by-step explanation: