I can't understand how I did the piecewise function wrong, I think I've done it exactly like that before. How is the ampersand misplaced?
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$$q = \begin{cases} 5x, & \text{ if }55\\ 2x, & \text{ if }41 \end{cases}$$
$$q = \begin{cases} 5x, & \text{ if }55\\ 2x, & \text{ if }41 \end{cases}$$
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2$\begingroup$ It looks like you could salvage your formatting by switching changing "start" to "begin". I chose only to include "if" in the argument of \text, because the number are already formatted within the double-dollars. $\endgroup$– amWhySep 29, 2021 at 16:06
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$\begingroup$ Could you elaborate on what the essential difference is? Was the issue that I had dropped down the different lines? Also, I think I replicated this exactly, yet it still shows the same message. $\endgroup$ Sep 29, 2021 at 16:07
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1$\begingroup$ Aha of course! It was "begin", not "start". Thank you :) $\endgroup$ Sep 29, 2021 at 16:08
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$\begingroup$ As a user of TeX.SE. I would to put \text{ if } 55 instead of \text{ if }55. $\endgroup$ Oct 3, 2021 at 19:55