The version of Flash I got for Dolphin browser was 11.1 but the Pearson Etext/MyMathLab site only supports versions 11.2 or higher.
So I sideloaded the Puffin browser and it worked liked a charm!
The Puffin browser is only downloadable from the Amazon Appstore for non-kindle devices. However, you can install this on your android phone, and then use ES File Explorer to send the apk to your kindle for install. This is safer than downloading an apk from a random website.
On a side note, I discovered that the Puffin browser allows me to watch Amazon Instant Video on my android phone, so that is a plus.
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