Data is manipulated and binary instructions are executed by computers. What's the point of binary?

If the value 8 is stored in the memory cell corresponding to the address 5, what is the practical difference between writing the value 5 into cell number 6 and copying the contents of cell number 5 into cell number 6?

Can you please help me solve these questions Question 2 a. You have built a computer that uses 9 bits to represent unsigned integers. You decide to use it to perform the following calculation: 320 + 394. What is the result? (Give your answers both in binary and in decimal) b. The computer you built also has a 16-bit addressability. You decide to add some memory to it and now your computer has a total of 30,000 bytes of memory. What is the minimum number of bits that you need in order to represent your address space?  c. Consider the circuit that adds together two 16-bit 2's complement numbers (consisting of a half-adder and a bunch of full-adders chained together). Is this an example of combinatorial logic or sequential logic? Why?   d. What is the largest decimal number that you can represent with a 3-digit octal number? (give your answer both in decimal and in binary).   e. Represent the difference of 0o611 and 0o365 in octal.

DO YOU THINK IT'S TRUE OR FALSE?The advantage of zero-address instruction computers is that their programs are short; the disadvantage is that the instructions need a large number of bits, resulting in programs that are quite long.