Answer:
D) 4
Step-by-step explanation:

73,980=70,000+3,000+800+90+0
100=100+00+0
Answer:
T = 3
Step-by-step explanation:
To find the period, find the distance it takes to complete one cycle.
Its impossible to draw a trapezoid with just three right angles.
a trapezoid has 4 sides, which means all the angles inside the trapezoid must add up to 360 degrees.
if you have just 3 right angles (90x3), you already use up 270 degrees. Leaving you with just 90 degrees left, which is also a right angle. That means, there has to be four, if you have at least 3.