There are several fractions that are equivalent to 4/5. Some are 8/10, 80/100, 800/1000. They all equal the same decimal: 0.8
The answer is D, the ordered pair (5,3)
Complentary angle = 90 degrees
90 - 16 = your answer
Vertex = (3, 5)
focus = (3, 7)
directrix is y = 3