Please help me please help me out with these (a) I don't know how to solve this (a) 2 and 3

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Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?

The 7th grade has collected $200 for a field trip that would cost $600. the teachers decided to ask $50 from additional students to cover the cost. how mny students must pay to cover the cost ? a 16studentsb 80studentsc 160studentsd 8students show work