Adam bought a apples for $1.50 each and b oranges for $2 each. he spent 1.50a+2b dollars. what does 2b represent?

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Which one ? is the answer and how to find this answer

Factor the expression using the gcf. the expression 21m−49n factored using the gcf