Binary to decimal conversion help?

Please show all steps for each part

a) Convert 252 (base 10) to a binary number.

b) Convert 01010101 (base 2) to a decimal number.

c) What is the binary and decimal equivalent of the lowercase letter z?

d) Translate the following message into decimal numbers and then a character message:

01001000 01100001 01110000 01110000 01111001 00100000 01001110 01100101 01110111 00100000 01011001 01100101 01100001 01110010 00100001

e) What is the largest natural decimal number that can be represented by an 8 bit binary sequence?