1. Reconsider the case of Alice and her stockbroker, Bob. Suppose they decide not to use a session key. Instead, Alice pads the message (BUY or SELL) with random data. Explain under what conditions this approach would be effective. Discuss how the length of the block affects your answer.

Use the inverse of the function y=x^2-18x to find the unknown value [tex]y = \sqrt{bx + c \: + d} [/tex]

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*