1. Well, first of all, a term in an equation is the variables and/or numbers when they are together. For something to be one term, it cannot be added or subtracted or else, that is more that one term and if it is a term, then it can multiplied or divided. In this equation: 4x + 6 + 5y + 10, there are 4 terms.
2. 3x^2 + X + 10 + 5x = 3x^2 + 6x + 10
So, in conclusion, the answer to this question is: D. 3x^2 + 6x + 10.