Set up an equation to calculate the following (create your own variable names):
a. The area of a room.
b. The wall area of a room including windows and doors.
c. The wall area of a room not including two windows and a door.
d. The number of miles given a number of feet. (Use 5,280 feet per mile.)
e. The percent increase (or decrease) of a value given the beginning number and the ending number. How would the result differ between increase and decrease?

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step-by-step explanation:

9-15%

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.