book Maths Puzzle Numerical Ability

-2/3k-4=12 please show me how to solve

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in our class for algebra 2 we are working on probablity and also permutations and combinations.

a test contains 20 questions. the teacher asks you to answer 15 questions. How many different ways can you answer 15 questions. At what points does the graph of f(x)=x^2+3x-18 intersect the x-axis?