I can't figure out the last three pleas help me out and give me an explanation

(1 point) In this problem we explore the relationship between password length and cryptographic security. Suppose a password consists of 6 ASCII characters. You can review the ASCII characters here.. Exactly 27 = 128 of these codes are for printable characters; we will assume every character in the password is printable. What is the size of the keyspace that consists of passwords of this form? 12816 What is the equivalent key length in bits? 42 Assuming that you could check one password every 10-10 seconds, what is the worst case running time for cracking this password by brute force search (in days)? 0.00509 Now assume that the user used only 28 characters from the keyboard. What is the key length in bits in this case? How many days, in the worst case, would it take to break this weaker password? You can't round to the nearest day here be as exact as possible. 481890304 Supposing you used only 28 characters, how long is the shortest password that achieves 177 bits of security? 35