39. Elena is painting her room. She can paint 350 square feet of wall space in hours. At this rate, how long will it take her to paint her room if it has 825 square feet of wall space?
0.74 hour
4.14 hours
b. 3.13 hours
d. 4.13 hours

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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.

if im not mistaking its

step-by-step explanation: