Question 844573
{{{ f(x) = -15 - (1/9)*x }}}
{{{ f(-18) = -15 - (1/9)*(-18) }}}
{{{ f(-18) = -15 + (18/9) }}}
{{{ f(-18) = -15 + 2 }}}
{{{ f(-18) = -13 }}}
The answer is (C)