You can try using latex instead.

In the algorithm section write

$ansmathml1 = "\left(-\infty, \dfrac{1}{6}\right]"; $ansmathml2 = "\left(-\infty, \dfrac{1}{6}\right)";

Then in the answer boxes put for example 

\( $ansmathml1 \)

Here is the result.

@chrisb @mcla Thank you both for the math app files, these look good! Preferably I would want the option to draw both linear lines and hyperboles, so if you know of a way to do this let me know. For now, I will try to adjust these math apps a bit to fit my needs, but I am not that skilled yet at Mathapp, so if you have any tips, please let me know

@Metahofzicht Nailed it. I found out how to fix it.

My grading code:

local I:=II:
if evalb(simplify(algsubs(I = a^4/(32*sqrt(3)), algsubs(C = 192, $RESPONSE) = $RV1))) then 1.0;
elif evalb(simplify(algsubs(I = a^4/(32*sqrt(3)), algsubs(C[1] = 192, $RESPONSE) = $RV1))) then 1.0;
elif algsubs($fact2 = 1,$RESPONSE) <> $RESPONSE then 1.0;
else 0.0;
end if;

Custom previewing code: local I:=`I `:printf(MathML[ExportPresentation]($RESPONSE));

my algoritm:

$fact2 = "E*a^4/L^3";
$RV1 = "$fact2*2*sqrt(3)";
$RVdisplay = "printf(MathML[ExportPresentation]($RV1))";