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 Dec 11 awarded Nice Answer Nov 2 awarded Popular Question Sep 23 awarded Notable Question Jul 20 awarded Nice Answer Jul 15 awarded Yearling May 2 awarded Notable Question Apr 21 awarded Nice Question Jan 16 awarded Popular Question Dec 25 revised Find the matrix for T with respect to the standard bases. edited body Oct 20 revised How is it sometimes helpful to use cross multiplication in order to complete proportions with a variable? edited tags Oct 20 comment How is it sometimes helpful to use cross multiplication in order to complete proportions with a variable? It's hard to tell what you're asking. Are you asking for a proof or explanation as to why this works? Or are you asking why it's necessary to check your solution afterwards? Sep 30 awarded Explainer Sep 24 awarded Autobiographer Jul 31 awarded Popular Question Jul 25 comment Parametrization Question It's hard to tell what your confusion is. For a line integral, you're integrating with respect to the curve. You only parameterize a curve with a single variable, so you wouldn't use $dx dy$. Jul 15 awarded Yearling Jul 2 awarded Curious Jun 28 revised What is the summation notation for the Fibonacci numbers? username change Jun 28 comment What is the summation notation for the Fibonacci numbers? @DantheMan Because it's just taking two numbers and adding them together. It's basically just the definition of the Fibonacci sequence. Jun 28 accepted Does anyone know why this inclusion exclusion calculation isn't working?