Four different stores have the same digital camera on sale. the original price and discounts offered by each store are listed below. rank the stores from the cheapest to most expensive sale price of the camera.
store a: price $99.99 and discount of 15%
store b: price $95.99 and discount of 12%
store c: price $90.99 and discount of 10%
store d: price $89.99 and successive discounts of 5% and 5%

dcba answer is whatever option that'll be

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.