Help me!! 1. 6 + 7 = ...
2. 6 - 7 = ...
3. 6 - (-7) = ...
4. -6 - 7 = ...
5. -6 + (-7) = ...

please include the steps!!

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1.) 6 + 7 = (5 × 2) + (1 + 2) = 10 + 3 = 13✔

2.) 6 - 7 = (5 - 5) + (1 - 2) = 0 + (-1) = -1✔

3.) 6 - (-7) = 6 + 7 = (5 × 2) + (1 + 2) = 10 + 3 = 13✔

4.) -6 - 7 = (-6) + (-7) = -(6 + 7) = -13✔

5.) -6 + (-7) = -(6 + 7) = -13✔

24 units

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.