Corrections for questions

Author: craig-dsilva

number-systems/README.md

@@ -8,7 +8,7 @@ Convert the decimal number 14 to binary.
 Answer: 1110
 
 Convert the binary number 101101 to decimal:
-Answer: 43
+Answer: 45
 
 Which is larger: 1000 or 0111?
 Answer: 1000
@@ -23,7 +23,7 @@ What is 10001 + 10001?
 Answer: 100010
 
 What's the largest number you can store with 4 bits, if you want to be able to represent the number 0?
-Answer: 0000
+Answer: 15
 
 How many bits would you need in order to store the numbers between 0 and 255 inclusive?
 Answer: 8
@@ -35,7 +35,7 @@ How many bits would you need in order to store the numbers between 0 and 1000 in
 Answer: 10
 
 How can you test if a binary number is a power of two (e.g. 1, 2, 4, 8, 16, ...)?
-Answer: 
+Answer: A number when converted to binary should have a single "1" in it.
 
 Convert the decimal number 14 to hex.
 Answer: E
@@ -56,10 +56,10 @@ If reading the byte 0x21 as an ASCII character, what character would it mean?
 Answer: !
 
 If reading the byte 0x21 as a greyscale colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
-Answer: Dark brown
+Answer: Dark grey
 
 If reading the bytes 0xAA00FF as an RGB colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
 Answer: Dark purple
 
 If reading the bytes 0xAA00FF as a sequence of three one-byte decimal numbers, what decimal numbers would they be?
-Answer: 2575
+Answer: 170, 0, 255