Find two numbers, if their sum is −11 and their difference is 41

15 and -26

Step-by-step explanation:

the fist # = x

The 2nd # = y

equation:    x + y - 11 = -x + y - 41

                           + 11   +x  -y  +41  

                                  2x=30

                                     x=15

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents