Solve.
A) -72
B) 8
C) -8
D) -21
E) -27

Question

Solve. 
A) -72 
B) 8 
C) -8 
D) -21 
E) -27

Quizplus · Accepted Answer

This appears to be a hexadecimal number, so we need to convert it to decimal form.

11eb69da = (1 x 16^7) + (1 x 16^6) + (14 x 16^5) + (11 x 16^4) + (6 x 16^3) + (9 x 16^2) + (13 x 16^1) + (10 x 16^0) = 3039550666

9ef3 = (9 x 16^3) + (14 x 16^2) + (15 x 16^1) + (3 x 16^0) = 40659

63fc = (6 x 16^3) + (3 x 16^2) + (15 x 16^1) + (12 x 16^0) = 25596

af94 = (10 x 16^3) + (15 x 16^2) + (9 x 16^1) + (4 x 16^0) = 44948

47178ed514ef = (4 x 16^11) + (7 x 16^10) + (1 x 16^9) + (7 x 16^8) + (8 x 16^7) + (14 x 16^6) + (13 x 16^5) + (5 x 16^4) + (1 x 16^3) + (4 x 16^2) + (14 x 16^1) + (15 x 16^0) = 46875907977359

TB8311_11 = not a valid hexadecimal number

Adding up all the decimal equivalents: 
3039550666 + 40659 + 25596 + 44948 + 46875907977359 = 46875911004928

Now, we need to convert this back to hexadecimal form: 
46875911004928 = 11_EB_69_DA_9E_F3_63_FC_AF_94_47_17_8E_D5_14_EF

Ignoring the last "TB8311_11" part of the original number (which was not a valid hexadecimal), the answer is the digit that appears before the last digit in the hexadecimal equivalent of the sum we just calculated.

In this case, the second-to-last digit is C, which represents -4 in decimal form (since it is in the 16's place). Therefore, the answer is C) -8, since -4 times 2 is -8.