exam Maths Puzzle Numerical Ability

4. If f and g are linear functions with graphs that are perpendicular, show that the slopes of the graphs of f-g and g-f are both -1.

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#24
Quality control
Over a period of time, the manufacturer of a Carmel-center candy bar found that 3.1% of the bars were rejected for imperfections
(a) If a candy bars are Use the LCD to determine which fraction is greater

26. 2/5,3/10

Any help with this equation would be greatly appreciated:)