A reflection over the Y-axis would be the flipped point or set of points across the y axis while still retaining the same distance from the y-axis.
:)

If this is what you mean then the degree of the polynomial would be 3 since 3 is the highest exponent of all the terms.
The best way too solve it is to cross multiply. When you get the answer tell me and I’ll check it
A dot plot would show 7 points for numbers greater than 2.
A histogram would have a maximum of 7 bars.