Beth sold half of her comic books and then bought nine more. shoe now has 28. with how much did she begin?

Step-by-step explanation:

I believe the answer would be 38 i'm not 100% sure but here is why i think so. If Beth sold half of her comic books and then bought nine more that would mean ahe had 19 before she bought the other 9 so 19x2 which is 38 so she began with 38 then sold half which is 19 and then bought 9 more to now have 28.

900 degrees

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.