Are there any pictures or examples to answer? Can't answer a question when they is no reading
Issues that you should look for to correct the proofreading stage:
Grammar
Spelling
Punctuation
To find the distance between two points on a number line, we just take both points turn them to being positive and add.
20 + 6 = 26 units apart.
Best of Luck!
A) summarize it so you understand the main point