The noun clause is <span>how the Aztecs made their astronomical calculations.
</span>Just invert the whole sentence - The subject of my next paper is <span>how the Aztecs made their astronomical calculations.
</span>The whole clause is used as the direct object.
As far as I remember, a triangle equals 180 degrees. 31+35=66. 180-66=114. 114/38=3. So b=3.
C because Islam has lots of followers
