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I've been trying to get this to work, but I keep getting errors saying Paragraph ended before \end was complete. I can't see where the issue is though. Could someone help?

\documentclass[12pt, a4paper]{article}


When hydrogen is the fuel used:
U_t=2249\ln \frac{1\times10^{6}{1\times10^6-424.6t}}

When kerosene is the fuel used:
U_t=1737\ln \frac{1\times10^{6}{1\times10^6-1022t}}

When hydrazine is the fuel used:
U_t=2025\ln \frac{1\times10^{6}{1\times10^6-1004t}}

share|improve this question
You have a problem with \frac, it needs two parameters. And you have one in the code. – m0nhawk Jan 7 '14 at 18:42
Thank you, I hadn't realized I'd made a mistake with the braces over there. – TheSarcasticScientist Jan 8 '14 at 2:04
up vote 2 down vote accepted

As noted above, there is something wrong with the "Fraction". A fraction is created using the \frac{numerator}{denominator} command. See here for some excellent hints.

Otherwise, try it with:

When hydrogen is the fuel used:
share|improve this answer
Thank you so much. I've changed it. Do you have any tips for avoiding mistakes with braces in the future, or is it just a matter of remaining vigilant? – TheSarcasticScientist Jan 8 '14 at 2:05

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