13. Suppose an 802.11b station is configured to always reserve the channel with the RTS/CTS sequence. Suppose this station suddenly wants to transmit 2,500 bytes of data, and all other stations are idle currently. As a function of SIFS and DIFS, and ignore propagation delay and assuming no bits errors, calculate time required to transmit the frame and receive the acknowledgement. (Assume the transmission rate of 802.11b is 10Mbps, SIFS is 20 μs, DIFS = SIFS + 2 * slot time, CTS=RTS=ACK=slot time, and slot time = transmission time of an empty frame which is 125 bytes)

1. ask the user how many questions are in the quiz. 2. ask the user to enter the key (that is, the correct answers). there should be one answer for each question in the quiz, and each answer should be an integer. e. g., 34 7 13 100 81 3 9 10 321 12 might be the key for a 10-question quiz. you will need to store the key in an array. 3. ask the user to enter the answers for the quiz to be graded. there needs to be one answer for each question. note that these answers do not need to be stored; each answer can simply be compared to the key as it is entered. 4. when the user has entered all of the answers to be graded, print the number correct and the percent correct. 5. add a loop so that the user can grade any number of quizzes with a single key. after the results have been printed for each quiz, ask "grade another quiz? (y/n)." note: you only have one array (the key). you are not creating a new key for each set of quiz answers.

Which computer tools allow you to communicate with coworkers, family, and friends

On the pie chart below, which “slice” represents 30% of the budget?