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A function $f$ is defined by $f(x)=2 x-5$. Write down the value of: (i) $f(0)$, (ii) $f(7)$, (iii) $f(-3)$.
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$f$ is defined by $f(x)=2 x-5$
$\therefore \quad f(0)=2(0)-5=-5$
$f(7)=2(7)-5=9$
$f(-3)=2(-3)-5=-11$
$\therefore \quad f(0)=2(0)-5=-5$
$f(7)=2(7)-5=9$
$f(-3)=2(-3)-5=-11$
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