Find sec theta if tan theta = -4/3 and cos theta = 3/5

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

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15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m