12. (6 points) Add the following decimal numbers by converting each to five-digit 10's complement form, adding, and converting back to sign and magnitude. a.) 24760 + 5038 b.) 24760 + (-5038) c.) (-24760) + 5038 13. (6 points) The following equations perform signed addition/subtraction. Perform the calcuation using 6-digit 10's complement addtion. Convert the result back to sign-and-magnitude if necessary. a.) 24109 35968 b.) 35968 -(-70925) c.) (-10265) - (-7586) 14. (6 points) The following decimal numbers are already in six-digit 10's complementary form. Add the numbers. Convert each number and your result to sign-and-magnitude, and confirm your results. a.) 1250 + 772950 b.) 899211 + 999998 c.) 970000 + 30000