The requested calculations that were probably worked out as in Roman times are as follows:-
MDCCLXXVI+SC = MDCCCLXXVS => 1776+(100-0.5) = 1875.5
MDCCLXXVI+LXXXXVIIIIS = MDCCCLXXVS => 1776+99.5 = 1875.5
MDCCLXXVI-SC = MDCLXXVIS => 1776-(100-0.5) = 1676.5
MDCCLXXVI-LXXXXVIIIIS = MDCLXXVIS => 1776-99.5 = 1676.5
Note that the way we now work out Roman numerals today had absolutely nothing to do with the ancient Romans whatsoever because the rules now governing the Roman numeral system were introduced during the Middle Ages.
QED
1.5 subtracted from 8.5 is one of infinitely many possible answers.
see the link for the answers.
This question has several answers. Some people research them because they find whales interesting and others because they want to learn more about whales. Bit, people who research whales have their own answers and other people who research whales have different answers. Some people's answers are not so different and other peoples answers are completely different.
There are infinitely many possible answers. For example, 44.1 - 0.1 or 990044 - 990000
what time is it
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If I only know the area, I can't tell you the dimensions. It all depends on the shape. A circle and a square give two different answers, and there are millions of rectangles, with different dimensions, that are all perfectly good and completely correct answers.
Well, I can think of two. What time is it... and What is the weather right now.
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Be completely honest.
All of the SAT questions are different... each time the test is taken... even the tests students have is not the same in the sam room on the same day. Plus, telling anyone, or finding out the answers to the SAT is completely illegal and will cause in the erasing of your scores... as well as the person who told you the answers...