Yes it is a rational number because it can also be written as a fraction.
The graph of any function that is simply an integer will be a straight vertical line if it is x = [integer] or straight horizontal if y = [integer]. Because this is x = 6, the graph will be a vertical line 6 units to the right of the origin.
300. You're multiplying 30 by 10, so you take the 0 off the ten and add it to the 30; it becomes 300
1. Combine all of the like terms so that you can simplify it, if they are not combined already.
2. Drop all of the constants and coefficients, the constant terms are all of the terms that are not attached to the variable.
3. Put the term in decreasing order of their exponents.
4. Find the power o the largest term.
5. Identify the degree of the polynomial.
6. Know that the degree of a constant is zero.
Hope this helps!