Answer:
5
Step-by-step explanation:
2:16-2:18=3
180ft-185ft=5
You already have the answer. It is "One type of proof is a two-column proof. It contains statements and reasons in columns. Another type is a paragraph proof, in which statements and reasons are written in words. A third type is a flowchart proof, which uses a diagram to show the steps of a proof." which looks correct to me.

Step-by-step explanation:

Donald will have 20x+10 dollars