exam Maths Puzzle Numerical Ability

if f(x)=5x-1
find (a-2)

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exam Other Question

A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100lb. of a mixture that will sell for $11.25 per pound. How many of each type of bean should be used in the mixture? How do find the x-intercept and the y-intercept of 8x-2y=5