Answer:
to sell 7000 it took 10 weeks
it took 3 weeks to sell 210 books
Step-by-step explanation:
A because two negatives make a positive
Subtract the sum of the angles from 180 degrees to get the missing angle. For example if a triangle in a quadrilateral had the angles of 30 and 50 degrees, you would have a third angle equal to 100 degrees (180 - 80 = 100).