Answers

Base 2	1	1	1	1
Base-10 Value	8	4	2	1
Binary Readout	Base-10 Value
a. 1101	1 + 0 + 4 + 8 = 13
b. 1001	1 + 0 + 0 + 8 = 9
c. 1011	1 + 2 + 0 + 8 = 11
d. 0101	1 + 0 + 4 + 0 = 5
e. 0110	0 + 2 + 4 + 0 = 6

Extra Points Question:
The 4-bit code for a voltage of 14 is 1110.
0 + 2 + 4 + 8 = 14