Math characters are being displayed incorrectly in a webpage. eg. Þ is being displayed instead of what I think should be ⇒

I am using Firefox 24.0 in Linux Mint.
I am currently doing a math test. Incorrect characters are being displayed.
There are only true/false questions on this math test. The questions on it are supposed to be very easy basic algebra questions, but because the characters are not loading properly, I cannot tell what they are.
A few examples from the test:
Are the following statements true or false:
|-7|=Ö49=7
Ö8-Ö29=Ö(-21)
Ö8-Ö29=-Ö21
3x=6 Þ x=2
(x-2)(x+2) = 1 Þ x-2 = 1 or x+2 = 1
Based on how they are being used, I assume Ö should be a √, and that Þ should be a | or ⇒
What is happening here? How do I fix this?
Are my guesses correct?

What font is specified if you check that via the right-click context menu in the built-in Inspector?
Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

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