George starts with a number. he takes away 7, then squares it, adds 6, subtracts 13,  multiplies it by 4 and subtracts 1. 
he ends up with 7. 
what was george’s original number?  

10 or 4.

Step-by-step explanation:

[(x - 7)^2 + 6 - 13 ] * 4 - 1 = 7

(x^2 - 14x + 49 - 7) * 4 - 1 = 7

4x^2 - 56x  + 196 - 28  - 1 - 7 = 0

4x^2 - 56x + 160 = 0

4(x^2 - 14x + 40) = 0

(x - 10)(x - 4) = 0

x = 10 , 4

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer