D, because there are several students that are in your school. There would be many different answers.
You need to know these two formulas:

For example,

Answer:
180 = 40 + 10x
Step-by-step explanation:
Answer:
Number - 47
Step-by-step explanation:
difference means subtract
Number - 47
Answer:
Yes, one of a rhombus's properties is that the diagonals bisect vertex angles.