What is the sum of the measures of two supplementary angles?                 a.  45°      b.  180°      c.  270°      d.  90°

Shryia read a 481 -page-long book cover to cover in a single session, at a constant rate. after reading for 1.5 hours, she had 403 pages left to read. how fast was shryia reading? pages per hour how long did it take her to read the entire book? hours plz i realy need this

Which of these tools or constructions is used to inscribe a hexagon inside a circle?

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?