Indentify the leading coefficent in the follwing polynomial 12x^5 y^2 + 5x^2 y - 3y + 2

I kinda confused about the leading coefficen cause I know it's in the first term. But I'm not sure if it's 12 or 1 or both.

Which set of lengths could represent the sides of a triangle? a. 3, 7, 10 b. 4, 5, 10 c. 6, 8, 14 d. 12, 6, 7

Suppose you are analyzing the relationship between time and distance given in a table,and there are 4 values for each quantity.you divide distance 2 minus distance 1 by time 2 minus time 1.you then divide distance 4 minus distance 3 by time 4 minus time 3 and get a different answer.what can you say about the relationship?

Solve for x. i’m bad at geometry me