exam Maths Puzzle Numerical Ability

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

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exam Other Question

in 2007 there are 350 libraries in southern illinois. this is a 75% increase over 2000. how many were there in 2000? I do not understand how to solve this, please help.
Solve the following system by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
x + 5y = 10 and -2x - 10y = -20