exam Maths Puzzle Numerical Ability

if f (x) = 4x - 3, find the following:
f (-1)

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exam Other Question

What is an equivalent expression for sqrt5(1/25)^(x+1) ??? I think the answer is 5^(-x-1) ????? When x number of units are sold, the price of each unit (in dollars) is given by p= x/2 + 75

Find the unit price when the following quantities are sold: 2, 7, 9, 11.