1. Are two points collinear?
Yes, they must be. You can always draw a line between two points.
2. How do you find the reciprocal of a decimal?
If it is an "easy" number such as 2, do it in your head.
i.e. Reciprocal of 2 is 1 ÷ 2 = 0.5
If it is a more difficult number such as 3.75 use the button on your calculator.
i.e. 0.2666666 which rounds to 0.27 (to 2 sig,fig.)
3. How do you find the reciprocal of a fraction?
Turn it "upside down". If it is a mixed number, change it to an improper fraction first.