The aspect of of instruments that improved during the Romantic period was the valves. The correct answer is D, valves.
Answer:
they do predict a moment in time!
<span>D.
Its original name is the Fuller Building, but it reminds people of a flatiron.</span>
Explanation:
you would either take and add them together to equal 90 or take them separate like for example 4x+1=90
it would be equal to 90 because they are complementary angles which add up to 90
-hope this helps
I would say the answer is B