The answer is 5/9.
(P.S. I got the step by step solution from a Socratic Question and Answer website)
Solve for <span>M</span><span> </span><span>by</span><span> </span><span>simplifying</span><span> </span><span>both sides of the</span><span> </span><span>equation</span><span>, then isolating the</span><span> </span><span>variable</span><span>.</span><span>M=<span>−<span>9</span></span></span>
The last one does not represent a function because for it to be a function none of the x’s can repeat and in the last one the 0 repeats.
Add the lengths of all sides