I think that the answer is 12. hope this helped! ^^
The Molasses Act of March 1733 was an Act of the Parliament of Great Britain (citation 6 Geo II. c. 13), which imposed a tax of six pence per gallon on imports of molasses from non-English colonies. Parliament created the act largely at the insistence of large plantation owners in the British West Indies.
The answer is A 90 degrees because RST makes a right angle