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72 students, 21 are seniors. If you select one student randomly from this group, the probability that this student is a senior is:? If f(X)= -15x + 22, how would i evaluate the following expressions? 1) f . f-1(348) 2) f . f-1(X)? Please help me answer the first question? How do you find the discriminant of the equation, 3x^2-xsqrt{7}-3=0? What is consciousness and why is it only considered for humans?