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What is the notation for a ray?
A line with an arrow on one end. Looks almost exactly like the symbol for a line segment, just with the arrow on one end.
What is the name of this sequence 1 3 6 10 15 21?
This is the sequence of triangular numbers. You draw one dot. Then you draw two dots in the line below - one to the left and one to the right of the first dot. You now have a triangle, of three dots. Then you draw three dots in the next line and you get a triangle with 6 dots. Next, four more dots in the next line giving a triangle with 10 dots. The name is easy to understand if you can visualise or even actually draw these dots. It is difficult to demonstrate through an ordinary word processing package.
What is a symbol in math?
Plus + minus - Times * or X Divide one line and 2 dots over and under the line (almost like a fraction)
How can you connect 25 dots with 8 lines?
It depends on where the dots are located. If they are all collinear only one straight line is required. For a 5x5 grid, only 5 lines are required.
What is an arrow with one line below it mean in math?
If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater than or equal to"
