(section: 2 / paragraph: b / line: 11)
Yes, this is allowed as long as each part is correctly defined.
(section: 2 / paragraph: b / line: 3)
The standard English keyboard is identified for use with all Science Olympiad tournaments. However, each tournament may - at their discretion and announcement to competing teams - provide additional or alternate languages that may be used. If the PC standard 101 keyboard is able to make Chinese characters, this would only be acceptable if the event supervisor has identified non-English language may be used. For nationals, English is the identified language. Using keyboard symbols to create non-English words will not be acceptable.
(section: 2 / paragraph: b / line: 7)
As long as what is written is readily apparent it refers to the "and" symbol and not something else, it would be accepted. Keep in mind that the "+" is not the same as the "and" symbol.
(section: 3 / paragraph: d / line: 1-3)
No, fractions may be referenced as 1/2 or 3/4 etc.
(section: 3 / paragraph: d / line: 2)
Yes - as long as defined as coordinates.