exam Maths Puzzle Numerical Ability

I am drawing a blank on this; do I multiply or add the denominators?
(x-1/3)*(x+1/3)

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exam Other Question

If f(x)=x^2-6x+8, what is the value of f(7)-f(3)?

a. -1
b. 0
c. 14
d. 15
e. 16 The cost of premium gasoline is 5% more than the cost of regular gasoline. If regular gasoline is $1.60, find the price of premium