exam Maths Puzzle Numerical Ability

lines a and b are perpendicular. The slope of line a is given. What is the slope of line b?

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Rational Expressions

divide
4/(x -6) by 40/(7x - 42) The attendance at a ball game was 400 people. Student tickets cost $2 and adult tickets cost $3. If $1050 was collected in ticket sales, how many of each type of ticket was sold?