Gavin does yard work around the neighborhood. He has 3.5 pounds of grass seed in his shed and buys an additional 5.25 pounds of grass seed from the store. If he uses 1.25 pounds of grass seed for 1,000 square feet, how many 1,000-square-foot sections can he plant with grass seed? A.
7
B.
10
C.
6
D.
7.5

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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.

the answer is 5/14.

hope this .