scale: 1 inch to 7 feet actual area: 147 square feet scale: 1inch to 8 feet actual area: 256 square feet scale: 1 inch to 5 feet actual area: 225 square feet scale: 1inch to 4 feet actual area: 128 square feet area of scale drawing scale and actual area scale drawing area: 8 square inches scale drawing area: 9 square inches scale drawing area: 4 square inches scale drawing area: 3 square inches​

i would have to say it is c.

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.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)