What is the binary representation of the following hexadecimal numbers?
a. a4693fbc
b. b697c7a1
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Corresponding Binary numbers are as following:

A4693FBC=10100100011010010011111110111100.

B697C7A1 = 10110110100101111100011110100001.

Explanation:

A single digit hexadecimal number is a 4 bit binary number.So for each hexadecimal bit we have to find the corresponding 4 bit binary number.

A=1010

4=0100

6=0110

9=1001

3=0011

F=1111

B=1011

C=1100

and write them in the same sequence of their hexadecimal number.

A4693FBC=10100100011010010011111110111100.

B=1011

6=0110

9=1001

7=0111

C=1100

7=0111

A=1010

1=0001

B697C7A1 = 10110110100101111100011110100001.

these  signals travel  down a part of the neuron called the axon, which is like a wire that carries the  signal  to othernerve  cells. on average a  nerve  cell sends a  signal  at about 50 meters per second, which is over 100  miles  an hour!