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What is sin 7x/4 ? i need on this urgent trig

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.