exam Maths Puzzle Numerical Ability

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

f(-1)

Can you show me how to figure this, I do not understand.

Thank you.

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exam Other Question

Simplify the expression.

18. - 3n/19 - 4n/19

Any help with this equation would be Greatly</b> appreciated. please help solve for x the problem is log(little x)32 = 5